disabuse translation system

the apparently attempted context renaming cannot work this way - while
the code would see the renamed context, lupdate would be oblivious of
that, and consequently the translations would not fit.

additionally, lupdate won't recognize the TR() alias at all any more.

Change-Id: I47baeb55a85a59b3c261153ed0c1e17726ffd284
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>
stop interpreting Tr() and TR() as aliases for tr()

it's completely braindead to do that - qt has no such functions, and the
behavior was undocumented, producing highly unexpected results.

if somebody actually needs that behavior, he can explicitly define
aliases nowadays.

Change-Id: I0afd02b190397b94ec127b6805fd2c593c2766d6
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
add 5.2 changelog

Change-Id: Ia2402e40c457270ef6008ea15684a96109329c5c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>