Use guarded path for obsolete files (bug 1060634)

- Update model file_path method
- Add test
Extract/compile script.  Today's lucky number is 2821.
fix typos in es
update legal docs
Commit from Mozilla Verbatim by user michael.koehler1@gmx.de.: 1984 of 1984 strings translated (0 fuzzy).
Delete testing.milos
add xh and zu locales. bug 1074330
Always stringify/parse items in storage (bug 1072277)
Commit from Mozilla Verbatim by user tonnes.mb@gmail.com.: 1984 of 1984 strings translated (0 fuzzy).
Merge branch 'master' of ssh://github.com/mozilla/zamboni
Commit from Mozilla Verbatim by user tonnes.mb@gmail.com.: 1984 of 1984 strings translated (0 fuzzy).
Merge pull request #2618 from clouserw/1074330

add xh and zu locales. bug 1074330
Log zippy product UUID for easier debugging
Commit from Mozilla Verbatim by user yfdyh000.: 1984 of 1984 strings translated (0 fuzzy).
fix tests
Merge branch 'master' of ssh://github.com/mozilla/zamboni
Commit from Mozilla Verbatim by user kohei.yoshino@gmail.com.: 1984 of 1984 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user petercpg@mail.moztw.org.: 1984 of 1984 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user cesperanc@.: 1984 of 1984 strings translated (0 fuzzy).
script to help marketplace pre-load onto gaia