Added modification from another repo

https://github.com/URpages/cmsplugin-embedded-menu/blob/919866bb3314b26d7b8781f55fca28363e716f5e/cmsplugin_embeddedmenu/models.py
Slight changes
Update models.py
Update models.py
Changed SafeString to SafeText
Modified models.py
Added MenuTitle etc. to context
Fixed Subtite assignment
Merge pull request #3 from Glenf/master

Unicode error fix