Complete language support to all GUI tabs

[Ski90Moo]

Wraps user-facing string literals with tr() across all major tabs and adds a complete Spanish (es) translation file as proof of concept for multi-language support, addressing issue #680.

Tabs covered: Site/Weather Data, Construction Sets, Materials, Schedules, Thermal Zones, Space Types, Loads, Facility, HVAC Systems, Inspector panel IDD fields, Output Variables (1051 names), Simulation Settings, Measures, Run Simulation, and Results Summary.

Key patterns established:

• tr() for compile-time strings in Q_OBJECT classes
• QCoreApplication::translate(IDD/OutputVariables/TaxonomyCategories) for runtime strings from the OpenStudio SDK and taxonomy.xml
• addItem(tr(Display), EnglishData) + currentData() for model-bound combo boxes where SDK values must stay in English
• Bilingual display format for IDD fields and output variable names so engineers can cross-reference EnergyPlus documentation without switching the application language

translations/OpenStudioApp_es.ts grows from ~200 to 3017 entries.
New languages only require a new .ts file with no further C++ changes.

The exception is the Geometry tab HTML files (geometry_editor_start.html and geometry_preview.html) each contain a hardcoded JavaScript dictionary keyed by locale code. We could:

Option A — Keep the Geometry tab HTML as an exception requiring separate edits.

Option B — Improve the architecture (better): Have the C++ side inject the locale into the HTML page at load time via QWebEnginePage::runJavaScript(), and move the translations out of the HTML into the .ts file.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

DView Units Conversion dialog

The "Would you like to display your Energy+ data in IP units?" dialog shown when opening DView for detailed reports is rendered by the dviewx64.exe binary (wxWidgets) and cannot be translated through Qt's .ts system.

A companion PR has been opened against the upstream wex library to add --ip/--si CLI flags to DView: NatLabRockies/wex#197

Once that PR merges and a new DView binary is deployed, the OpenStudio side will show its own translated Qt dialog and forward the user's answer to DView via CLI flag, bypassing DView's English-only prompt. The relevant code is already in place in ResultsTabView.cpp and commented out pending the new binary.

Extra testing required

• ScheduleFileInspector - especially the separator
• VariablesTab

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[Ski90Moo]

I have read the CLA Document and I hereby sign the CLA

[macumber]

This is awesome @Ski90Moo! I will check this out!

[Ski90Moo]

Thank you @macumber. It is rough, but a good start. I would like your feedback on the html issue.

[Copilot]

Pull request overview

This PR expands internationalization across the OpenStudio Application UI by wrapping user-facing strings with Qt translation APIs and adding a significantly more complete Spanish translation as a proof of concept (Issue #680). It also introduces tests to validate the .ts file structure/content and (optionally) runtime .qm translation loading.

Changes:

• Wrapped many GUI string literals in tr() / QCoreApplication::translate() across tabs, inspectors, and grid views.
• Added bilingual display formatting for SDK-driven names (eg. Output Variables, IDD fields) to show Translated (English) when non-English.
• Added a new translation-focused GTest suite and wired it into the app test target.

Reviewed changes

Copilot reviewed 98 out of 100 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/shared_gui_components/WorkflowView.cpp	Translates “drop measure” placeholder text.
src/shared_gui_components/WorkflowController.cpp	Translates section headers for measure categories.
src/shared_gui_components/OSGridController.cpp	Translates “Custom” category label and apply-button text.
src/shared_gui_components/LocalLibraryView.cpp	Translates tooltips/button labels in the local library footer.
src/shared_gui_components/LocalLibraryController.cpp	Translates taxonomy category names at render time.
src/openstudio_lib/WindowMaterialSimpleGlazingSystemInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialShadeInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialScreenInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialGlazingRefractionExtinctionMethodInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialGlazingInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialGasMixtureInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialGasInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialDaylightRedirectionDeviceInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WindowMaterialBlindInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/WaterUseEquipmentInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/VRFGraphicsItems.cpp	Translates VRF drag/drop placeholder labels.
src/openstudio_lib/VariablesTabView.cpp	Adds translated+bilingual output variable display and localized frequency display with English data values.
src/openstudio_lib/ThermalZonesTabView.cpp	Translates main tab title.
src/openstudio_lib/ThermalZonesGridView.cpp	Translates grid headers/categories via QCoreApplication::translate.
src/openstudio_lib/SteamEquipmentInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/StandardsInformationMaterialWidget.cpp	Translates standards/measure-tags labels.
src/openstudio_lib/StandardsInformationConstructionWidget.cpp	Translates standards/measure-tags labels.
src/openstudio_lib/SpaceTypesTabView.cpp	Translates main tab title.
src/openstudio_lib/SpaceTypesGridView.cpp	Translates headers/categories/filter labels; some tooltips still hardcoded.
src/openstudio_lib/SpacesTabController.cpp	Translates spaces sub-tab titles.
src/openstudio_lib/SpacesSurfacesGridView.cpp	Translates grid headers/categories.
src/openstudio_lib/SpacesSubtabGridView.cpp	Translates filter labels; stores English keys in combo box data for SDK values.
src/openstudio_lib/SpacesSubsurfacesGridView.cpp	Translates grid headers/categories.
src/openstudio_lib/SpacesSpacesGridView.cpp	Translates grid headers/categories.
src/openstudio_lib/SpacesShadingGridView.cpp	Translates grid headers/categories.
src/openstudio_lib/SpacesLoadsGridView.cpp	Translates grid headers/categories.
src/openstudio_lib/SpacesInteriorPartitionsGridView.cpp	Translates grid headers/categories.
src/openstudio_lib/SimSettingsTabController.cpp	Translates “Simulation Settings” tab title.
src/openstudio_lib/ServiceWaterGridItems.cpp	Translates tooltips and drop-zone placeholder text.
src/openstudio_lib/ScriptsTabView.cpp	Translates “Measures” tab title and sync button strings.
src/openstudio_lib/SchedulesTabView.cpp	Translates schedules sub-tab title.
src/openstudio_lib/SchedulesTabController.cpp	Translates schedules sub-tab titles.
src/openstudio_lib/ScheduleSetInspectorView.cpp	Translates schedule set inspector section labels.
src/openstudio_lib/ScheduleOthersView.cpp	Translates “Schedule Others” type names returned to the list view.
src/openstudio_lib/ScheduleOthersController.cpp	Translates unsupported-action message text.
src/openstudio_lib/ScheduleFileInspectorView.cpp	Translates labels and attempts to translate separator choices (but bind() will overwrite).
src/openstudio_lib/ScheduleDialog.cpp	Translates dialog labels and “None/unitless” strings.
src/openstudio_lib/ScheduleDayView.hpp	Adds Q_DECLARE_TR_FUNCTIONS for QGraphicsItem subclasses to enable tr().
src/openstudio_lib/ScheduleDayView.cpp	Translates schedule day UI strings/tooltips and keyboard prompt text.
src/openstudio_lib/ScheduleConstantInspectorView.cpp	Translates labels (one includes leading whitespace in the source string).
src/openstudio_lib/ScheduleCompactInspectorView.cpp	Translates labels.
src/openstudio_lib/RunTabView.cpp	Translates run tab title, button/checkbox labels, and status text.
src/openstudio_lib/ResultsTabView.cpp	Translates Results UI labels and some report names; “Custom Report N” uses concatenation.
src/openstudio_lib/ResultsTabController.cpp	Translates “Results Summary” tab title.
src/openstudio_lib/RefrigerationGraphicsItems.cpp	Translates refrigeration drop-zone placeholder text.
src/openstudio_lib/PeopleInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/OtherEquipmentInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/OSItemSelectorButtons.cpp	Translates toolbar button tooltips.
src/openstudio_lib/OSDropZone.hpp	Changes default text arg to empty so ctor can apply translated default.
src/openstudio_lib/OSDropZone.cpp	Applies translated default “Drag From Library” when text is empty.
src/openstudio_lib/OSDocument.cpp	Translates left-side main tab button labels.
src/openstudio_lib/MaterialsView.cpp	Translates materials category names returned to list view.
src/openstudio_lib/MaterialRoofVegetationInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/MaterialNoMassInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/MaterialInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/MaterialAirGapInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/LuminaireInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/LoopLibraryDialog.cpp	Translates HVAC library dialog titles/buttons/system names.
src/openstudio_lib/LoadsView.cpp	Translates loads category names returned to list view.
src/openstudio_lib/LightsInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/library/geometry_editor_start.html	Adds an in-HTML Spanish translation dictionary + DOM rewrite for headings/paragraphs.
src/openstudio_lib/InternalMassInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/HVACSystemsTabView.cpp	Translates main tab title.
src/openstudio_lib/HVACSystemsController.cpp	Translates system selector entries and HVAC type labels; translates some drop-zone text.
src/openstudio_lib/HotWaterEquipmentInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/GridItem.cpp	Translates drop-zone placeholder and “Supply/Demand Equipment” labels.
src/openstudio_lib/GeometryTabController.cpp	Translates geometry tab title and sub-tab titles.
src/openstudio_lib/GeometryPreviewView.cpp	Injects locale into embedded web content; translates some UI strings.
src/openstudio_lib/GeometryEditorView.cpp	Injects locale into embedded editor; translates most UI strings and some dialogs.
src/openstudio_lib/GasEquipmentInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/FacilityTabView.cpp	Translates facility tab title.
src/openstudio_lib/FacilityTabController.cpp	Translates facility sub-tab titles.
src/openstudio_lib/FacilityStoriesGridView.cpp	Translates grid headers/categories and filter label.
src/openstudio_lib/FacilityShadingGridView.cpp	Translates grid headers/categories and uses English keys in filter combo data.
src/openstudio_lib/FacilityExteriorEquipmentGridView.cpp	Translates grid headers/categories and view titles.
src/openstudio_lib/ElectricEquipmentInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/ConstructionsView.cpp	Translates constructions category names returned to list view.
src/openstudio_lib/ConstructionsTabController.cpp	Translates constructions sub-tab titles and main tab title.
src/openstudio_lib/ConstructionInternalSourceInspectorView.cpp	Translates inspector labels and drop-zone text (and file gained a BOM).
src/openstudio_lib/ConstructionInspectorView.cpp	Translates inspector labels and drop-zone text.
src/openstudio_lib/ConstructionFfactorGroundFloorInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/ConstructionCfactorUndergroundWallInspectorView.cpp	Translates inspector labels (and file gained a BOM).
src/openstudio_lib/ConstructionAirBoundaryInspectorView.cpp	Translates inspector labels and comments (and file gained a BOM).
src/openstudio_lib/BuildingInspectorView.cpp	Translates building inspector labels.
src/openstudio_app/test/Translation_GTest.cpp	Adds tests to validate .ts content and optionally .qm runtime translation.
src/openstudio_app/CMakeLists.txt	Adds Translation_GTest.cpp to the test sources.
src/model_editor/InspectorGadget.cpp	Adds bilingual IDD field display names with runtime translation lookup.

---

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[jmarrec]

I need to review this in more details but thanks a lot @Ski90Moo

FWIW, there are a couple of issued that might arise (and that AI wouldn't catch):

Once you translate a string, you can no longer call something like:

QString qs = tr("SomeEnglishValue");
modelObject.setXXXX(qs.toStdString()).

One example: be96ac1

[Ski90Moo]

I need to review this in more details but thanks a lot @Ski90Moo

FWIW, there are a couple of issued that might arise (and that AI wouldn't catch):

Once you translate a string, you can no longer call something like:

QString qs = tr("SomeEnglishValue");
modelObject.setXXXX(qs.toStdString()).

One example: be96ac1

Thank you for the feedback @jmarrec. Let me look into this.

[Ski90Moo]

Thanks for flagging this @jmarrec — that's exactly the kind of subtle breakage that's hard to catch in review.

I did an exhaustive audit of every toStdString() and currentText() call added by this PR. Here's what I found:

tr().toStdString() calls (21 occurrences) — all are the second argument to addCheckBoxColumn / addSelectColumn, which is const std::string& tooltip. These feed the column header tooltip in the Qt grid widget, never the model SDK.

currentData().toString().toStdString() → model setter (3 occurrences):

• ScheduleFileInspectorView: m_sch->setColumnSeparator(m_columnSeparator->currentData().toString().toStdString()) — uses currentData() ✓
• VariablesTabView: m_variable->setReportingFrequency(m_combobox->currentData().toString().toStdString()) — uses currentData() ✓
• SpacesSubtabGridView filter comparisons: data = currentData().toString() then data.toStdString() used as a filter predicate against model getter values — not a setter ✓

UtilityBillsView translated fuel names (12 occurrences): std::pair<FuelType, std::string> where the translated string goes only to OSCollapsibleItemHeader (display label). The FuelType enum key is what reaches the model. ✓

currentText() == tr(...) comparisons (5 occurrences in GeometryEditorView and SpacesSubtabGridView): Used for UI branching (which editor class to show, whether to apply a filter). No model setter in the branch bodies. ✓

field == tr(...) column-type switch in FacilityExteriorEquipmentGridView (~30 occurrences): The translated string discriminates which addNameLineEditColumn / addParentNameLineEditColumn call to make. Model access goes through function pointers (&model::ModelObject::setName), never through the translated string itself. ✓

Zero instances of a translated string reaching an SDK model setter. The addItem(tr(display), QStringLiteral("EnglishData")) + currentData() pattern is used consistently wherever a combo drives a model write — this is also documented in translations/TRANSLATION_WORKFLOW.md as a required pattern.

[macumber]

Is translate_new_languages.py missing?

[Ski90Moo]

translate_new_languages.py was a one-off bootstrap script for the 4 new languages; those are now fully covered by translate_all_languages.py which handles all 18. Left it out as redundant.

[macumber]

What about if we want to add a new language?

[Ski90Moo]

Added an Adding a new language section to TRANSLATION_WORKFLOW.md covering the five steps: add the .ts entry and post-build copy commands to translations/CMakeLists.txt, add the locale to the LANGUAGES dict in translate_all_languages.py, then run the standard lupdate → fix_and_unvanish → translate_all_languages → fix_and_unvanish → lrelease pipeline. lupdate creates the .ts file automatically on the first run.

Commits: f6642ba (TRANSLATION_WORKFLOW.md "Adding a new language" section), 3bce8c5 (translation helper scripts), d3b7090 (adds add_language_to_menu.py to automate the five C++ touch points when wiring a new language into the menu).

[macumber]

Do you need to add these new translations to the list translations/CMakeLists.txt?

[Ski90Moo]

Yes — added id, ko, pt, and tr to TS_FILES and added post-build copy commands in 4c22eb1. Indonesian follows the same commented-out pattern as Hindi/Vietnamese/Greek since Qt does not ship qt_id/qtbase_id. Portuguese uses the pt_BR variants (qt_pt_BR.qm, qtbase_pt_BR.qm, pt-BR.pak) as Qt does not ship a plain pt variant.

[macumber]

I looked at 4c22eb1 but it doesn't show up on this PR's changed files?

I think there is a typo in the existing translations/CMakeLists.txt ${WEBENGINE_PAK_FOLDER}/vi.pak is listed for German.

[Ski90Moo]

Fixed — line 151 was copying vi.pak (Vietnamese) instead of de.pak for the German WebEngine locales block. That was a copy-paste error from the Vietnamese section directly above it. Audited all 18 language blocks; it was the only mismatch.

Re the commit not appearing in "Files changed": the "does not belong to any branch on this repository" message is normal for cross-fork PRs — the commit is on Ski90Moo/OpenStudioApplication (the fork), not on the openstudiocoalition repo directly. GitHub knows about it because the PR is open, but it lives on the fork side. The reason it may not be visible in the "Files changed" tab is that this PR is very large (18 .ts files each several thousand lines, plus dozens of .cpp files), and GitHub stops rendering the diff after hitting its size limit. The changes are in the cumulative diff — please search for translations/CMakeLists.txt in the "Files changed" search box to jump directly to it.

Commits: 4c22eb1 (register 4 new languages in CMakeLists.txt with .ts entries and post-build copy commands), 3e1c01c (fix de.pak copy-paste typo).

[jmarrec]

We need to take a careful decision on whether we think OutputVariables should be translated at all: poor translations, and too many of them (1432) to burden a human with.

The IDD bit might fall into the same bucket: it has even more entries: 3842, though a spot check didn't concern me as much in terms of translation

One thing to consider is that, while I didn't do timings, I'm pretty sure the build got a lot lengthier.

[jmarrec]

Suggested change

	# OpenStudio Application — Translation Workflow
	This document describes the full pipeline for adding or updating translations in
	`OpenStudioApp_<lang>.ts` files.
	# OpenStudio Application — Translation Workflow
	This document describes the full pipeline for adding or updating translations in
	`OpenStudioApp_<lang>.ts` files via AI.
	**NOTE:** The preferred way is still to use a bilingual user do the translations themselves using Qt Linguist. Please refer to the Wiki [Internationalization: Translating the OpenStudioApplication to another target language](https://github.com/openstudiocoalition/OpenStudioApplication/wiki/Internationalization:-Translating-the-OpenStudioApplication-to-another-target-language)

[Ski90Moo]

Done in b70dc87 — added a callout block at the top of the doc noting this covers the AI-assisted pipeline and linking to the wiki for the preferred human-translation (Qt Linguist) workflow.

[jmarrec]

Diff is too large for github to comment directly here.

All translation files, including this one, have this block in there:

    <message>
        <location filename="../src/model_editor/InspectorDialog.cpp" line="585"/>
        <source>Purge unused objects</source>
        <translatorcomment>La palabra purgar no tiene el mismo contexto en Español.</translatorcomment>
        <translation>Borrar todos los objetos sin usar</translation>
    </message>

I have spot checked only a few locations so far and I'm finding that it is what I expected:

• For regular english (eg: "Add an object") the translation is good enough
• For domain-specific wording, it's really less than ideal
  • "Dry bulb temperature" shouldn't be "Température de Bulbe humide" (literal translation), but "Température Humide"
  • Glass Doors are translated as "Portes en Verre" instead of the more apt "Portes vitrées" (that would be ok)
  • Most of the HVAC specific stuff is just bogus
  • etc

I'm noticing that the OutputVariables have been translated. I don't think I ever expected to do that:

1. I find it confusing because you'd typically have to read the E+ I/O reference guide to understand what a variable represents.
   a. Edit: Ok I see you at least kept the English name of the variable too in parentheses, smart choice (se picture below)
2. I don't think the variables shouldn't even be proposed for translation since the tab is populated by a call to static std::vector<std::string>& ModelObject::outputVariables() const. That also explains why the snippets don't have any <location> tag
   a. @Ski90Moo did you "trick" Claude into adding these translations?
3. The french translation appears horrendous for these, and given it's 1400 entries, I'm not particularly inclined to manually translate them. Perhaps it's a bad idea.

Qt Linguist also correctly flags a lot of the translations do "not have the same leading and trailing whitespace as the source text".

Eg Name: becomes Nom : when it should be Nom :

Some things have a a built line break, that isn't respected and it shows weirdly in the UI (and I'm not talking about how absolutely ridiculous the translation sounds in French lol)

    <message>
        <location filename="../src/openstudio_lib/LoopLibraryDialog.cpp" line="74"/>
        <source>Packaged DX Rooftop VAV 
with Reheat</source>
        <translation>Unité de Toit Toute Faite DX VAV avec Réchauffage</translation>
    </message>

As a result it's cut-off here:

(the next translation is a gem 😆 "Packaged Rooftop VAV with Parallel Fan Power Boxes and reheat" is translated to "Toit-Terrasse Emballé VAV avec Boîtes de Puissance à Ventilateur Parallèle et Réchauffage" suggesting that there is a flat roof that is wrapped (for shipping perhaps?) and it has )

[Ski90Moo]

Thanks for the detailed review. Addressing each point in 31f9508:

Whitespace (Name: etc.): Fixed — added a step to fix_and_unvanish.py that restores leading/trailing spaces in translations to match the source string. Resolved ~6900 Qt Linguist warnings across all 18 languages.

Embedded newlines: Fixed — for LoopLibraryDialog HVAC system names, removed the hard \n from C++ source strings and made the dialog resizable (setMinimumSize + setSizeGripEnabled + setWordWrap). For all other strings (grid column headers, drop zones, etc.) the \n is a genuine layout constraint; applied proportional-position insertion to restore missing newlines in translations.

Domain-specific quality: Agreed the machine translations are imperfect — particularly HVAC terminology. That is the nature of the AI-assisted bootstrap; the intent is for bilingual contributors to refine via Qt Linguist. The note added to TRANSLATION_WORKFLOW.md (b70dc87) now makes this explicit.

OutputVariables: Will address separately — see the open question about whether these 1400 entries should be translated at all.

[macumber]

My thought was that we would send a link to an RC to everyone who has expressed interest in translations and ask then to review their native languages and contribute changes in translations back.

[Ski90Moo]

Yes, agreed. I would first like to fine tune the machine translation to help take the load off of the contributors. I have some ideas for using a prompt with context, from Big Ladder, for the Output Variables, and possibly the Idd object fields, that might help clear up some of the poor machine translations. I am also reconsidering the Tooltip idea. If the user could hover and left or right-click to copy the English text, that would help them quickly find what they need in the EnergyPlus documentation pdfs. In this case maybe we wouldn't need to display the English in Italics? If it is a hurry, I can remove the Output Variables and/or Idd translations from the .ts files for now and we can address them in a future PR?

[jmarrec]

This is a nice concept.

If we go this route, we should tweak the display though, it's cluttered

The english original field name should be on its own line in italic, or perhaps a it should be a QTooltip.

[Ski90Moo]

Good point — went with HTML formatting instead: the translated name on the first line, English original in small gray italics on the second line (31f9508). Tooltip was considered but rejected: a non-English speaker cross-referencing EnergyPlus documentation while looking at the inspector would find it frustrating to have the English name appear and vanish with cursor movement. The persistent second line keeps both names visible at all times.

[Ski90Moo]

We need to take a careful decision on whether we think OutputVariables should be translated at all: poor translations, and too many of them (1432) to burden a human with.

The IDD bit might fall into the same bucket: it has even more entries: 3842, though a spot check didn't concern me as much in terms of translation

One thing to consider is that, while I didn't do timings, I'm pretty sure the build got a lot lengthier.

Another thought I had: would it be possible to gather user provided feedback/translations on these? For example, the user could right or left click the translation, it would copy the specific English and target language strings and take them to a dialog online to submit an alternative translation? This would greatly accelerate the translation process (or complicate it 😅).