Translate es strings

[jmmartinell]

Before submitting

• I have pulled and merged the latest changes from the repository

Language(s)

Spanish — both values-es (generic) and values-es-rES (Spain)

Summary

Special equipment (Slayer, dwarven, tower, divine, silver, dragon families) plus runes and combat spells, in strings_items.xml.

Detailed changes

File	Lines
values-es/strings_items.xml	250
values-es-rES/strings_items.xml	237
Decisions: Slayer kept as-is (skill/proper name); spell schools keep EN root with ES descriptors per established series pattern.

Anything else?

Verification

• ./gradlew :app:testDebugUnitTest :app:lintDebug :app:assembleDebug — all passing (same as CI)
• Verified on SM-E055F: Slayer Shop shows "Casco de Slayer / DEF +40", "Armadura de Slayer / DEF +80", "Grebas de Slayer / DEF +65", "Faldar de placas de Slayer" with "Comprar" buttons; no clipped text, no crashes
• aapt2 dump resources confirms es + es-rES ("Casco de Slayer", "Espada Divina", "Runa de sangre")
• XML/parity/order/placeholders clean; git diff --check clean

How this was produced

Translated by muse-spark-1.3-contributor (provider opencode-go) running in the gentle-pi harness (v3.7.0), and reviewed string by string by a native Spanish speaker who verified the result on a device build.