Fix parserTests.php for non-english test wikis

Fix parserTests.php for non-english test wikis

Running parserTests.php gives two failed test under a non-english wiki.

Both tests have corresponding article parts, which creates system
messages for the test.
While the messages gets added to the database, the language is not set
to en, so the created message gets under the wrong language into the
language cache.
When running the test, the language is set to en, but the message cannot
be found in the language cache. The message is not found.

Running test Bug 31098 Template which includes system messages which
includes the template... FAILED!
Running test Bug 32057: Title needed when expanding <h> nodes....
FAILED!

Change-Id: I18fb139e2227343018cdef737bda5aadb5c9fb35