update french translation

[merwok]

Problem

Untranslated strings in the FR localization

Solution

I translated most of them.

I also took the opportunity to add trimmed to a blocktranslation tag, to remove spaces and newlines from the translation entries.

And I removed the line numbers in the translation files: the filenames are very useful to look at the context for a translation entry, but the line numbers are not very useful and change all the time when the source files change, causing unnecessary churn and possible merge conflicts.

Acceptance Criteria

None

[matthewhegarty]

Thanks, looks like a sensible change.

Please could you add the --add-location=file flag to the makemessages command?

Feel free to update the Changelog and add your name to AUTHORS.

[coveralls]

coverage: 100.0%. remained the same
when pulling a2ed5c8 on caravancoop:update-fr
into 1d2b9fe on django-import-export:main.

[merwok]

done!