Add file location to the translation files

Makes it easier for the translators to check context and report
problems.
Split up the info string

Avoids having to translate the entire thing if just part of
it changes.
Generate the about text in a single place
Make some log messages more sane for translators
Make sure user visible strings are translated
Don't use tabs for indentation
Move copyright year out of string to avoid re-translation
Fix the build timestamp to be more translation friendly
Refresh translation files