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Adding to this issue, it seems that if I add an entry to a catalogue then switch to German and translate the title, save then switch to French I find the title is set to the German string I just edited (rather than the default English). There is also a small typo in the admin page title (see screenshot).

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"Adding to this issue, it seems that if I add an entry to a catalogue then switch to German and translate the title, save then switch to French I find the title is set to the German string I just edited (rather than the default English)"

i.e. when there are more than 2 languages on a site, the fallback for a missing content translation isn't necessary the site's default language, it may be any undetermined language.
I'm not sure we specified the behaviour, I'll have to think about that. I probably agree with you.

"There is also a small typo in the admin page title (see screenshot)."

This is an issue on the language pack apparently for that string, the tracker isn't the right place to resolve - needs to be filed as an issue on Transifex on the FR translation. I don't have the capacity to get intimately involved in any individual translations myself.

It was a bug, this should fix it:
https://github.com/ocproducts/composr/commit/cf5307046ab3224de322c403c36f5df964df8c77

Thankies <3

I had an extra bracket, which I just had to fix in
https://github.com/ocproducts/composr/commit/d2c74f510dbc76519e832c54a75067425fd2f539