Bump MODULE_VERSION to 5.2.1

Change-Id: Ie1b6620a0f238effb7f25083ab10aaa78ce7dfc4
Reviewed-by: Matti Paaso <matti.paaso@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
normalize numerus forms upon saving ts files

while linguist itself normalized the display, it would write out the
translation units as-is. this may be a problem for 3rd party tools and
manual editing.

the command line tools already do this normalization.

Task-number: QTBUG-35094
Change-Id: Ia309b07f31051c33adddeef519cff6d9b9a30a69
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>