Rename from PickSome to Deliberation

See merge request !4

This changes the labels, filenames, variable names to use "Deliberation"
and "Choice" instead of "PickSome" and "Pick".

This makes no attempt to migrate for past installations of the tool. Any
site that is currently using the PickSome tool will need to manually:

1. Rename the PickSome database to "Deliberation".
2. Update the LocalSettings import to import Deliberation instead of
   PickSome.

Issue #3

This allows us to use more complex messages specified in the i18n file
with variable replacement.

Show correct title in Special:SpecialPages

Fixes issue #1: Add correct i18n settings for Special Page list to show

This was the code that used to reside at
github.com/OpenTechStrategies/torque but needed to be split into
its own repository for maintenance reasons.

We pulled it at sha 3331953