fix(files_sharing): Cleanup error messages

[provokateurin]

Summary

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[provokateurin]

/backport to stable30

[provokateurin]

/backport to stable29

[provokateurin]

/backport to stable28

[nfebe]

Maybe some of the messages can be more specific? For example the try-catch that fails due to date parsing and only that can be a bit more explicit at maybe the expense of consistency with the same "Failed to..."

[provokateurin]

Maybe some of the messages can be more specific? For example the try-catch that fails due to date parsing and only that can be a bit more explicit at maybe the expense of consistency with the same "Failed to..."

Fixed. The called method was already returning a proper error message, so I aligned all the uses of it.