Remove use of "I" in favor of "you"

A comment by Pau on PS4 of Change-Id: I170f019b7eb5f19229b66a275732d320617c2c5e
where I initially opposed to the use of "your" versus "I":

Using "You" or My" for referring to the user are both valid and common approaches.

When talking about on-line communities it makes more sense to use "You", [..].
More info and examples on this at:
http://www.designingsocialinterfaces.com/patterns.wiki/index.php?title=Your_vs._My

Change-Id: I809b00a4bea33f5e330b6ee59d064bca5f278062