Inconstant naming for "bi-person-gear"-> "bi-person-fill-gear"

[cupatea]

There are a lot of icons named differently, some add "-fill" in the end, and some in the middle. E.g.: https://icons.getbootstrap.com/?q=-fill-

All icons should be named similarly with "-fill" at the end.

As appropriate, please include:

• The operating system does not matter
• Browser and version do not matter