I did the German translation. Although it's still not possible to import any as I get still the message that it didn't find any annotations.
Might this be due to that I didn't see any text to translate which corresponds to keywords in the "my clippings" file? For instance there was no
"- Highlight Pos. xxx", or
"Added at Friday...."?
Furthermore I found the following spots which didn't show up in the default.mo or did show up but still showed the english text in calibre:
- The error message telling me it didn't find any annotations
- The menu when clicking the Annotations button in calibre (except for the about)
- The loading dialogs when trying to fetch annotations
- Also the customize dialog (see attachment, except for the Cancel button)