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Add spamlist title inline validation

Authored by Theopolisme.

Description

Add spamlist title inline validation

Attempt to validate the spamlist title by checking
that it a) exists and b) has the "wikitext" contentmodel.
If these conditions are not met, massmessage-parse-badpage
will be displayed.

Bug: 58081
Change-Id: I87d2d4962573bf8c1743757aeb543f465ea36a0d

Details