Change button label for feching translations.

The label was not clear about the operation that the button would trigger,
so it was changed to clearly indicate that it would fetch translations.
Log a summary after fetching translations.

Stops messages for individual items that have no translations when
checking, adds messages that show the number of new translations
available for individual items, and shows a message indicating that
there was a check of translations, and how many translations were
found.
Merge branch 'segmentation'