gitignore: Remove po/*.po and po/LINGUAS

po files will now be tracked. This has the following benefits as listed
by Colin Watson:

  * Build processes would no longer be vulnerable to an external server
    potentially going down for an extended period of time; they'd be
    stuck with outdated translations until the server was fixed or came
    up with a workaround, but that's better than nothing.

  * It would be easier to manage branches of stable releases, rather than
    assuming that translations downloaded for master will match the POT
    files for a stable release.

  * Tests would be able to pass from a clean git checkout without relying
    on an external server, improving QA reliability.

  * It would be easier to make and test branches while offline.

  * The translations shipped with a release tarball could be tagged in
    git so that it's easy to investigate bugs in them.

  * Downstream distributors would be able to use git branches without
    having to fill in additional files.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

.gitignore

@@ -249,8 +249,6 @@ widthspec.bin
 /pata_test
 /po/*.gmo
 /po/*.mo
-/po/*.po
-/po/LINGUAS
 /po/Makefile.in.in
 /po/Makevars
 /po/Makevars.template