💻 stop copying over English content in Weblate

[Felienne]

It is not always clear to teachers untranslated content is shown when they see English content, it would be nice if we can show an icon or something (or a different color) if a content block is equal to English (tested with a text equivalence)

[Felienne]

Hi all (esp @boryanagoncharenko and @jpelay are relevant for this)!

My proposal is as follows, stepwise

• We change the default setting of Weblate to copy over content, and figure out what happens then (empty files? no files? placeholders?)
• In our code, detect if there is no file or whatever weblate does and catch it. For now, we can just show our English version. This does not change a lot right away, but is immediately better than what we have now, because in the current situation, if we update English, the copied files do not get updates, so a lot of languages have some outdated, previously copied over content in them.

When that is done, we can decide if we, as originally suggested in this issue, want to highlight the untranslated content, only for teachers or for everyone.

But let's get this piggy washed first! (this is a Dutch saying)