Remove all mostly untranslated PO files

We now only import PO files that are at least 75 % translated,
so we can delete now all other PO files. The patch only
removes the mostly untranslated files. Once a file becomes mostly
translated, the bot will import it again.

This removes all languages besides en_US and en_AU.

Change-Id: Ie5d98c0f56d3f79dee6453bacca7b76c110d249e
Closes-Bug: #1317794