Whatlinkshere: colon and anchor handling

[FlominatorTM]

Tested with

• https://www.wikitree.com/wiki/Space%3AStammtisch
• https://www.wikitree.com/index.php?title=Category:Germany&redirect=no
• https://www.wikitree.com/wiki/Category:Germany
• https://www.wikitree.com/index.php?title=Automated:Lang_Itmann%2C_West_Virginia&action=edit&redirect=no
• https://www.wikitree.com/index.php?title=Space:WikiTree_BEE
• https://www.wikitree.com/wiki/Space:WikiTree_BEE
• https://www.wikitree.com/wiki/Project:Germany

Please squash, since I have somehow named the wrong feature, sorry