QA: Remove dot from Cucumber feature name

Jenkins gets confused if Cucumber features end with dots. Also enabled
the feature for mobile sites.

See
https://wmf.ci.cloudbees.com/job/MobileFrontend-en.m.wikipedia.beta.wmfl
abs.org-linux-firefox/403/testReport/Basic%20site%20for%20legacy%20devic
es/

Change-Id: I2e5764c4f6a90de0adc6b83d10cb921514dc1074