rename zh_Hant_HK.po to zh_HK.po to match ll_CC.po pattern
As discussed in Telegram from here onwards and in this clickable issue the language file for Hongkong Chinese should be named zh_HK.po instead of the current zh_Hant_HK.po.
This MR will rename the file. But weblate will need to be pointed at the new file after merging. @Flohack74 I hope this can be done?
This fixes #95 (closed).
Edited by Guido Berhörster