[Cashtab] Better css for configure options

Summary: We cannot be sure of text length since some users translate Cashtab. So, support word-wrap for settings options. Improve styling so switch is always a constant size.

Test Plan:
npm test, review screenshot

before:

after:

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15691