gstreamer, gst-plugins*: fix localdata

* all gst* packages were producing LC_MESSAGES/.mo instead of
  LC_MESSAGES/gst*.mo and it was leading to file conflicts between gst*
  packages too
* for more details see
  http://lists.linuxtogo.org/pipermail/openembedded-core/2012-November/032233.html
* buildhistory diff, confirms issue fixed
  https://github.com/shr-distribution/buildhistory/commit/f2c0888c0e08dfb33cc0cdf384621fc499d4ac04


* Thanks to Enrico for simplier solution

(From OE-Core rev: f50e2984d9411a059b86d6c158e9416fceb84c3d)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>