Had to revert the changes in r14424 / r14427 due to massive side-effect breakage...

Had to revert the changes in r14424 / r14427 due to massive side-effect breakage on zh.wikipedia.org:
* Move parameter replacement before brace transformations in most of the
  wfMsg() family (except for wfMsgHtml). This allows things like {{plural:}},
  {{urlencode:}}, and {{fullurl:}} to be used in most cases correctly.
  The content or UI language will be used accordingly for (forContent)?.
* Work around glitch with the above in {{int:}}; skip redundant transformations,
  allow the including parser to do it.
* Fix {{int:}} to use content language, so it won't break caches and links
  tables and randomly include data from the wrong language.

Uncertain what the cause is of the breakage, I have a hard time duplicating it
and it looks massively wrong (should not be possible). Failure on Parser.php
line 590, claims var not array, but the check two lines above ensures that
it is first...