fix incomplete lang patching, add en-gb stub

en-gb is empty, so it's patched with en-us strings. Added so DD/MM/YY
date formatting was possible in the ui.

cl.md

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+This one isn't super big but includes some pretty important bug fixes.
+
+Features:
+* Link-only password resets: Instead of the user having to enter a code, a magic link is sent which will reset the password once clicked. The password reset PIN input sometimes seems broken on Jellyfin (at least for me) so this is kind of a workaround.
+* Proper time handling in the web UI: Times displayed on the invites & accounts tab now match the language you're using (e.g MM/DD/YY for en-US and DD/MM/YY for everywhere else). 12/24 hour time can also be toggled in the language menu in the top left.
+
+Fixes:
+* Fix missing "Last Active" time on newer versions of Jellyfin (#69)
+    * Time parser was rewritten so it should handle a lot more formats automatically now.
+* Fix bug where user expiry would change/disappear after a restart (#77)
+* Add missing attributes that weren't being stored in profiles (#76)
+
+Other:
+* Massively cleaned up build files