Bug 7749: Not all OKs on the start page are translatable

Bug 7749: Not all OKs on the start page are translatable

I don't really understand, why the " OK " would not get picked up by
the translation script, but removing the spaces made it work.

To test:
Verify that all OK buttons on the start page are translatable. The one
resisting translation was "Search catalog:"

Signed-off-by: mveron <veron@veron.ch>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>