Inconsistent icons and labels

[chalkos]

Some buttons that create new objects are labeled in different ways like "New X" or "Create Y".

There are also inconsistencies in the icons used, eg: the add icon (+) appears with a solid circular background but also without any background.

• [ ] find and fix label inconsistencies
• [ ] find and fix icon inconsistencies
  • [ ] add: change all fa-plus to fa-plus-circle