ui: Progressbar box frame in black

Change-Id: I93f7bf893cab724f51d5833e7178dd02576b6d06
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
ui: Fix incorrect i18n on buttons

Previously the defaults of the button labels were overwritten by
translation messages. This lead to incorrect button labels for some
dialogs.
To solve this the translation was pulled into the correct place.
Now the buttons either show the sane default or a custom label.

Change-Id: I55c09116e2e43511ff9b7f2513016ace7d1b6b8c
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>