Hello,

it seems that the definition of long time formats for the Czech language (in https://github.com/date-fns/date-fns/blob/master/src/locale/cs/_lib/formatLong/index.ts#L11) uses H instead of HH unlike other locales. This then results in weird behavior when switching between languages because strings like 1 hours 15 minutes change to hour 15 minutes (in Czech).

This behaviour was encountered in jellyfin-vue that uses date-fns 2.28.0 (https://github.com/jellyfin/jellyfin-vue/blob/master/package.json#L46).