updated translations

.tx/config

core/l10n/bg_BG.php

core/l10n/da.php

core/l10n/de.php

core/l10n/es.php

core/l10n/fr.php

core/l10n/nl.php

core/l10n/pl.php

core/templates/installation.php

core/templates/layout.guest.php

files/templates/admin.php

l10n/bg_BG/core.po

l10n/bg_BG/help.po

l10n/bg_BG/log.po

l10n/bg_BG/settings.po

l10n/da/admin.po

l10n/da/core.po

l10n/da/help.po

l10n/da/log.po

l10n/da/settings.po