Part of MBS-13117

There is no non-module file **.pl under lib/ anyway,
but even if there was any it would be for admin only.

Implement all eventually needed functions to prevent translating
messages destinated to admin in both admin and non-admin pages,
as part of MBS-13117.

Prevent translating messages destinated to admin in non-admin pages,
as part of MBS-13117.

It is equivalent to expand2react(cleanMsgid) but it makes it explicit
that it is intentionally to not translate messages destinated to admin,
as part of MBS-13117.

To prevent any further accidental localization in admin pages,
this patch makes CI tests to exit with error with a non-empty list of
lines calling localization functions (l, ln, lp, N_l, N_ln, N_lp).

There will never be any context needed for not translatable messages.

The column labels for languages and scripts were exposed to admins only
but still translated. These messages would be removed from translations
after the previous commit 05960f8 from the following files:

- root/admin/attributes/Attribute.js
- root/admin/attributes/Language.js
- root/admin/attributes/Script.js

However those will likely be needed again after resolving MBS-11178.

This patch preserves column labels and their translations by temporarily
defining these in a unused file until MBS-11178 gets resolved.