Add timestamp to help page
Right now, clicking on the help icon shows i.e.: Bitmask Desktop Client, Version 0.10a2-115-g808f9d3
This doesn't give any information how old the bundle is, for this you need to look into the git log.
I guess it's trivial to show i.e. Bitmask Desktop Client, Version 0.10a2-115-g808f9d3 (2017-08-31)
.