updated translations

apps/media/l10n/ca.php

apps/media/l10n/el.php

apps/media/l10n/es.php

apps/media/l10n/it.php

core/l10n/ca.php

core/l10n/da.php

core/l10n/de.php

core/l10n/el.php

core/l10n/es.php

core/l10n/fr.php

core/l10n/id.php

core/l10n/it.php

core/l10n/nl.php

core/l10n/pl.php

core/strings.php

l10n/bg_BG/core.po

l10n/bg_BG/settings.po

l10n/ca/core.po

l10n/ca/media.po

l10n/ca/settings.po