Add fa settings for social icons to make generic

[Jeremy Hopkins]

Add fa icon field for social icons to make them more generic.

With this it will be possible to change the icon and the lang strings to use these fields for things other than social links.

[Jeremy Hopkins]

Added settings for fa icons in e716e62 Need to:

• apply in front end
• add existing lang string into field description in admin so they read "social link icon 1 - facebook (where facebook is the current lang string)

[Jeremy Hopkins]

Fix #126

Improve fa labelling in social admin section.

Apply fa icon settings in front end.

→ <<cset cdd33032e601>>

[Jeremy Hopkins]

Fix #126

Improve fa labelling in social admin section.

Apply fa icon settings in front end.

→ <<cset cdd33032e601>>