LT-15566: Use Character Styles for Sense Number

- Add character style for Sense Numbers
- Change from using Font+bold+italic to this Style in MVC
- Update CSS generation
- Update tests
- Update tab orders in affected views

Developers may wish to run the following after applying this change:
for /d %d in (*) do ( rm -rf "%d\ConfigurationSettings\Dictionary" )

Change-Id: I9ce42a660f2b8b8c12a20147047690a6062be23f