Bug 5506 Improve translation script

Bug 5506 Improve translation script

[1] Update all .po files in once with this command:

    translate update

[2] For sysprefs, quoted text wasn't properly retrieved from .po file and so
    quoted strings wasn't translatable.

[3] The install process (translate -p install de-DE) was rewriting syspref
    .po file which isn't required anymore.

MUST be applied to [3.2] to get all syspref proper translation.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 814795da60318c70059fc1dfbe7be4da37109db0)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>