Fix the translation template version number (5->6)
KF5 and KF6 must be co-installable, so change the major version number which is part of the translation template name. UI messages only, as the documentation will be handled separately.
KF5 and KF6 must be co-installable, so change the major version number which is part of the translation template name. UI messages only, as the documentation will be handled separately.