use multiplication symbol × instead of letter x for closer

my new styling made this small inconsistency more noticeable
remove unimplemented parts of link dialog

the new style overrides were making this dialog look bad in a way it
wasn't before
remove HTML that creates extra boxiness in the gear dialog

at least for now i don't see what good it's doing there
Merge pull request #137 from oerpub/metadata-styling-changes-issues-139

Metadata styling changes issues 139
Merge remote-tracking branch 'origin/master' into undoredo

Conflicts:
	src/plugins/oer/semanticblock/lib/semanticblock-plugin.js