Standardize on sentence case (not title case) throughout for all buttons and text

[udaynwa]

[danbjoseph]

i prefer sentence case. i thought we had discussed this before but i don't remember what we decided?

[jhenshall]

Looking at other apps, sentence case is the standard. I think we should go ahead with it.

[danbjoseph]

E.g. "Change Username" should be "Change username" and "Total Swipes" should be "Total swipes" and etc