String fixes for mobile

Wear and tear -> Wear and Tear to avoid having a second string
extracted.

Performance paragraph: it's the only one without a closing period.

You're currently sharing/not sharing etc. When building I get warnings
about those two strings missing, I guess the extraction ignore the
Merge pull request #141 from flodolo/fixl10n

String fixes for mobile template
remove empty space from l10n string
Merge pull request #143 from ossreleasefeed/github-issue-142-space-in-l10n-string

remove empty space from l10n string