The calendar grid's header row and the week-start toggle label were the only
text in the shell that followed the system locale, so a German desktop drew
MO DI MI over an interface that is English everywhere else. Nothing chose that;
they were the only two places reading day names off Qt.locale().
Take them from en_US instead. Where the week starts still follows the locale:
that is a regional convention rather than a translation, and it stays
overridable through weekStartDay.
Dropping the trailing-period strip with it, since that existed only for the
locales this no longer renders.
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
(cherry picked from commit 25bee1d2a3)
David Heinemeier Hansson
2d3826aff3