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