Putting stuff back to sk_ instead of mo_ on sk strings.

Relevant command: find values*/strings_sk.xml -type f -exec sed -i 's/mo_/sk_/g' {} \;

mastodon/src/main/res/values-pt-rPT/strings_sk.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="mo_app_name">Megalodon</string>
+    <string name="sk_app_name">Megalodon</string>
     <string name="sk_pinned_posts">Fixado</string>
 </resources>