feat: Add in-context translation (solves #1738)

[teolemon]

What

https://support.crowdin.com/in-context-localization/#optional-parameters
To test before deploying widely. This will only work with a special locale called lol
https://github.com/openfoodfacts/openfoodfacts-server/blob/master/po/common/lol.po

Part of

• 🌐 Improve the translator journey (tracker) #5528

[hangy]

I tried adding the JavaScript with Chrome DevTools, but even after logging in, it doesn't display any translations for me. I suppose there would need some way to let Crowdin know which text is which, as the internal ID is different from the displayed text (which is why we have a custom version of gettext). Also, we shouldn't always include that script, since it immediately forces the Crowdin login dialog on the user:

[hangy]

• See feat: Add in-context translation (solves #1738) #2421 (comment)

[teolemon]

My understanding is that they have this pseudo language called lolcat. So the user would need to switch the website to lolcat, and then indicate the language.
Something like
fr-lolcat.openfoodfacts.org would possibly work.
translate-fr or fr-translate would be more intuitive

[teolemon]

@hangy you can try renaming lol.po to de.po https://github.com/openfoodfacts/openfoodfacts-server/blob/master/po/common/lol.po

[sonarcloud]

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