Normalize titles in template descriptions in context menu

For {{echo}} we would show "echo", but for {{Echo}} we would
show "Echo". Same for {{cite web}} vs {{cite_web}}. Normalize
these template names before displaying them in the context menu.

Reported by Matma Rex on IRC.

Bug: 66893
Change-Id: I84945aab13e53cd0aba529c298b5cc0b2e7eff1e
Merge "Normalize titles in template descriptions in context menu"