Add kn (Kannada) to LINGUAS_ALL

https://bugzilla.gnome.org/show_bug.cgi?id=738827
Indic Language Kannada Translation file

Another addition from C-DAC, Pune, India.
Addition of Gujarati (gu) to LINGUAS_ALL po file list

https://bugzilla.gnome.org/show_bug.cgi?id=738828
Indic Language Gujarati Translation File

From the team at C-DAC, Pune, India
Add kok@latin to LINGUAS_ALL (Konkani in Latin script)

https://bugzilla.gnome.org/show_bug.cgi?id=738829
Indic Language Konkani translation in Latin script

Konkani Language translation po file from C-DAC, Pune, India.
Revert "Remove bare percent sign in taxinvoice.scm, replace with English."

This reverts commit 289bfc2aefdf203881bc3e130cc98aa720e558df.
Fix some warnings found with msgfmt -c in the po files