Updated fix for Issue #155 - TAKE 2

Based on the discussion at the Sept. 21 meeting I updated the Action values in the Content module.  
Left and Right definitions were updated to refer to physical positioning and the following additional sentence was added: Note that the logical implication may depend on the dirction of the page. If the logic is important, use next or previous.

Up and Down were updated with the following definitions:
Down: Changes the location of the selected item(s) downward.
Up: Changes the location of the selected item(s) upward. 

Here is a draft of the response to I18N for the issue:

Thank you for your observation. We have added start, end, up, and down to the list of action values with the following definitions:
start — Moves to the beginning of a range, list, or sequence. This is typically used in a sequence of steps.
end — Moves to the terminus of a range, list, or sequence. This is typically used in a sequence of steps.
up — Changes the location of the selected item(s) upward.
down - Changes the location of the selected item(s) downward.

We have updated the definitions for left and right to specific physical positioning and to suggest the use of next and previous where appropriate:
Left — Changes the location of the selected item(s) to the left based on physical positioning. Note that the logical implication may depend on the dirction of the page. If the logic is important, use next or previous.
Right — Changes the location of the selected item(s) to the right based on physical positioning. Note that the logical implication may depend on the dirction of the page. If the logic is important, use next or previous.

The link for review is: https://raw.githack.com/w3c/personalization-semantics/issue155/content/index.html#values
Becky Gibson
Sr. Accessibility Strategist
Knowbility.org

The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
Co-Chair, Accessible Platform Architectures http://www.w3.org/wai/apa