Send sub-tasks to celery properly, even post_request_tasks (bug 1021158)

post_request_task before this patch only send tasks to celery inside
the request-response cycle, preventing indexation from being triggered
from inside a task (outside the request-response cycle).
Move apps/translations/ to mkt/translations/ (bug 1021204)
Merge pull request #2212 from diox/mv-translations

Move apps/translations/ to mkt/translations/ (bug 1021204)
Merge pull request #2211 from diox/tasks-inception

Send sub-tasks to celery properly, even post_request_tasks (bug 1021158)
some pep8 cleaning
remove references to global header/footer submodules (bug 1025263)
Commit from Mozilla Verbatim by user ibai@oihanguren.com.: 1379 of 2491 strings translated (0 fuzzy).
Merge branch 'master' of ssh://github.com/mozilla/zamboni
Commit from Mozilla Verbatim by user ibai@oihanguren.com.: 1380 of 2491 strings translated (0 fuzzy).
too many newlines
remove `type` from `CannedResponse` model (bug 1021837)
Merge pull request #2218 from cvan/canned-response

remove `type` from `CannedResponse` model (bug 1021837)
Merge pull request #2215 from cvan/rm-global

remove references to global header/footer submodules (bug 1025263)
Moved apps/files/ to mkt/ (bug 1021200)
remove legacy AMO cron jobs (bug 1026247)
Merge pull request #2219 from cvan/rm-amo-crons

remove legacy AMO cron jobs (bug 1026247)
remove legacy AMO tasks (bug 1026255)
Merge pull request #2220 from cvan/rm-amo-tasks

remove legacy AMO tasks (bug 1026255)
remove AMO templates (bug 1026119)
Merge pull request #2216 from cvan/rm-impala

remove AMO templates (bug 1026119)