CMS-3332 Site label used in content lists and and dialogues

Fixed overlay display. Update letter `S` position.
CMS-3332 Site label used in content lists and and dialogues

Added overlay display for the sites in `recently used` list.
CMS-3332 Site label used in content lists and and dialogues

Added overlay element to FormIcon.
Added overlay display for FormIcons in WizardPanel for the site
elements.
CMS-3332 Site label used in content lists and and dialogues

Update FormIcon overlay font family.
Merge pull request #699 from enonic/CMS-3332

CMS-3332 Site label used in content lists and and dialogues