Parsoid/Language conversion/Preprocessor fixups/20170501

About
Article counts from the 20170501 dump. All wikis are done.

Note that false positives are possible. Fixes are only truly necessary when the broken construct is inside a template, wikilink  , or template argument. Also, you decide how much you want to fix: if the local community doesn't care about whether stuff may look broken on pages outside the main namespace, you can just ignore those.

As User:DePiep is doing, please put your name in the "notes" column when you start working through a section in order to avoid duplicating work. Thank you!

Legend:
 * c: chemical-related articles
 * u: URLs -- All are done. -DePiep (talk) 13:32, 12 May 2017 (UTC)
 * o: other/misc articles
 * n: non-articles (everything outside namespace 0)