Fix broken wlan and she widgets.

These widgets needed further re-factoring following commit
409130bb1a6bc5e93d44cd2f302bb1acfcb90716
fallback to en_US locale if no pair for default currency

Closes #429
[doc] add missing stack layout parameters

Closes #431
Merge branch 'develop' of https://github.com/qtile/qtile into improved_match
Small fix