Revert "tests should use tests/i18n"

https://bugzilla.wikimedia.org/show_bug.cgi?id=66881

This reverts commit 5eee5725862e5bab84fd66c056d58b26bd7087ea.

Change-Id: Ic0bc53600bea1c5a7fd4b7ac4ef73c75080318e5
Merge "Revert "tests should use tests/i18n""