glimagesink: resize the viewport correctly on a caps change

with force-aspect-ratio=true, if the width or height changed, the
viewport wasn't being updated to respect the new video width and height
until a resize occured.
h264parse: don't unnecesarily set src_caps

https://bugzilla.gnome.org/show_bug.cgi?id=739374
h265parse: don't unnecesarily set src_caps

https://bugzilla.gnome.org/show_bug.cgi?id=739374
Update .po files
Release 1.4.4
glimagesink: clamp the resize width/height to >= 1 to avoid a GL error
opensles: reenable 48kHz sample rate