0.11-stable: Merge r6998 from trunk to fix #7147
'nb_NO' translation - first batch of changes (more to come).
Follow-up to r6991 (add missing import)
Ported r6980 (''TracGuide fixes'')
Fold a few lose lines into a normal block of text.
Wrap in i18n:msg.
Update catalogs.
Regenerate POT.
Add more German translation strings.
Submitted by: Axel Gembe See: #5475
i18n got merged into trunk.