Repeated no info available fields

[mattgarrish]

Would it be possible to define a single "no-info-available" ID to use whenever the generic "No information is available" string has to be output?

Right now, each category defines its own version of this string, which from a maintenance perspective looks like a source for errors to get introduced and from a translation perspective looks like a lot of redundancy.

Only the ways of reading section tailors these messages to the output, so those would need to stay.

[GeorgeKerscher]

I think this would be dood to do.

[gregoriopellegrino]

We have a problem: in techniques we use the HTML id attribute for strings, which must be unique for each document.
Possible solution, switch to a data-* attribute, as we did for principles.