update translations

apps/calendar/l10n/ar.php

apps/calendar/l10n/bg_BG.php

apps/calendar/l10n/ca.php

apps/calendar/l10n/cs_CZ.php

apps/calendar/l10n/da.php

apps/calendar/l10n/de.php

apps/calendar/l10n/el.php

apps/calendar/l10n/eo.php

apps/calendar/l10n/es.php

apps/calendar/l10n/et_EE.php

apps/calendar/l10n/eu.php

apps/calendar/l10n/fr.php

apps/calendar/l10n/gl.php

apps/calendar/l10n/he.php

apps/calendar/l10n/hr.php

apps/calendar/l10n/hu_HU.php

apps/calendar/l10n/ia.php

apps/calendar/l10n/id.php

apps/calendar/l10n/it.php

apps/calendar/l10n/ja_JP.php