tech talk prezo: Pants Essentials. Excellent feedback is excellent

Reviewed at https://rbcommons.com/s/twitter/r/1407/
Add missing class

Reviewed at https://rbcommons.com/s/twitter/r/1414/
Allow rbtools to be used from anywhere

Testing Done:
I used this to post https://rbcommons.com/s/twitter/r/1412, because I didn't have another handy way to use rbtools.

Reviewed at https://rbcommons.com/s/twitter/r/1413/
Fix error in string formatting

1. Fix mis-spelled key "cateegory".
2. Simplify complicated format-within-format.

Testing Done:
Manual testing.

Reviewed at https://rbcommons.com/s/twitter/r/1416/