new revisions UI does not work correctly in internet explorer

[adamsilverstein]

the new revisions UI fails to load correctly in IE (mostly tested in ie8, but probably fails for 7,8 & 9)

[adamsilverstein]

corrects template type, fixed revisions UI in IE

[adamsilverstein]

23999.diff​ corrects a small typo in the backbone/mustache template used by the revisions UI.

firefox, chrome and safari were all ignoring the typo; ie on the other hand was choking and the revisions diff, meta info, restore button etc. all failed to display. still see some other issues especial with tooltips, but at least now everything loads and works!

before:

after:

[SergeyBiryukov]

In 23934:

Fix closing tag in revisions UI. props adamsilverstein. fixes #23999.