Translation updates for 3.14.06 release

New languages:
    Kinyarwanda from Rwanda - rw-RW
    Swahili from Kenya - sw-KY

Renames:
    Thai from th-THA to th-TH
Update release notes for 3.14.6 release

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Merge remote-tracking branch 'translator/3.14.06-release' into 3.14.x

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Increment version for 3.14.6 release

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>