Follow the Android writing style:
https://developer.android.com/design/style/writing.html

* remove "Sorry" and "Please"
* remove unecessary "Try again later"
* use contractions ("don't" instead of "do not", etc.)
* capitalization
remove unused string
recapitalize url -> URL & fix apotrophes
s/>could/>Could/
Merge branch 'develop' into issue/726-writing-style

Conflicts:
	res/values/strings.xml
s/Create a WordPress.com blog/Create WordPress.com blog/
Merge pull request #744 from wordpress-mobile/issue/726-writing-style

fix #726 - writing style