This apply to teletext and DVD menus buttons.
Close #2516.

This is consistent with the vlcrc syntax. Shell scripts et al. are
unlikely to be aware of the locale decimal separator anyway.

This avoids the ugly blinking while resizing.
The embedding window should set the proper background in any case.

It will avoid some useless copy in video_output.

It seems that the field AVFrame::reference may change between the 2 calls.

AC_MSG_FAILURE is solely meant for configure check unexpected failure,
not for "normal" errors whereby a check detects a missing dependency.

It made things more complicated for MIT-SHM.

(Those should not have been in POTFILES in the first place)

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

Comment blocks starting by 'xgettext:' will find there way to vlc.pot and
the .po. You can use it to pass instructions or context to the translators

It's a special case and print the metadata of the l10n