Detect when a page is not completely translated, and add a disclaimer on top while building
When a lektor website changes it's strings, translators need to update the translations.
This results in sometimes having pages that are not completely translated.
We should detect this problem and invite readers to become translators. This can be done with a message that says, for example:
'This page is $% translated. Our translations are made by a team of volunteers. If you want to help us improve our translation to $LANGUAGE, please become a Tor translator'
This will help readers engage with the team in a more positive way, while also denoting when a translation has not been looked at for a while.