Reorder placeholders for i18n c-format compatibility

Summary:
Currently a2po exports files with a c-format tag, which means that plural forms "Failed receiving file from %2$s" are invalid for instance (it should be %1 to %n). Translations are subsequently blocked by the subversion pre-commit hooks.

This fix reorders the placeholders.

Reviewers: KDE Connect, eduisters

Reviewed By: KDE Connect, eduisters

Subscribers: kdeconnect

Tags: KDE Connect

Differential Revision: https://phabricator.kde.org/D17688