feat(l10n): add Occitan translations

Translation: Fossify/Calendar
Translate-URL: https://hosted.weblate.org/projects/fossify/calendar/oc/
Via: Weblate

Author: Quentin PAGÈS

app/src/main/res/values-oc/strings.xml

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+</resources>