Handle encoding in translation files

[atom-box]

In the French translation, a character (ampersand poundsign 039) is not displaying correctly in the view for
⚙️ > System > Import > Google analytics

[Findus23]

The translation string is correct (https://hosted.weblate.org/translate/matomo/plugin-googleanalyticsimporter/fr/?checksum=f881f6f5577e3d1f), so this is an issue in all languages and just doesn't appear in English because there are no non-letter-characters there.

Maybe we should expand the Matomo "development" language to a proper pseudolocalization where random non-ascii characters are added/replaced and increase the length of the English string by X% (as often things are cut off in the German translation simply because things are longer in German)

[sgiehl]

refs #19190

[sgiehl]

I think this one should be fixed with #19190.