Use placeholders for URLs in Translations

[teolemon]

What

msgctxt "warning_not_complete_obf"
msgid "This product page is not complete. You can help to complete it by editing it and adding more data from the photos we have, or by taking more photos using the app for <a href=\"https://play.google.com/store/apps/details?id=org.openbeautyfacts.scanner&hl=en\">Android</a> or <a href=\"https://apps.apple.com/us/app/open-beauty-facts/id1122926380\">iPhone/iPad</a>. Thank you!"

Use placeholders for URLs in Translations when the package name or the language can change.
Deprecate hardcoded URLs
This is error prone, and we loose opportunities

Part of

• 🌍 Make Open Food Facts work well in all countries in the world #5690

[teolemon]

We're loosing donations because of this

<a href="https://world.openfoodfacts.org/donate-to-open-food-facts?utm_source=login-open-food-facts"><img src="https://static.openfoodfacts.org/images/svg/donate-icon.svg" alt="Donate to Open Food Facts" /></a><p><<site_name>> is made by a non-profit association, independent from the industry. It is made for all, by all, and it is funded by all. You can support our work by <a href="https://world.openfoodfacts.org/donate-to-open-food-facts?utm_source=login-open-food-facts">donating to Open Food Facts</a> and also by <a href="https://www.lilo.org/fr/open-food-facts/?utm_source=open-food-facts">using the Lilo search engine</a>.<br/><b>Thank you!</b></p>