noosfero | WIP: Removes settings_item default value translation (!1089)

[Gabriel Silva]

New comment for Merge Request !1089:

https://gitlab.com/noosfero/noosfero/merge_requests/1089#note_21753546


I changed `wall_access` to integer, and refactored AccessLevels to use a hash. I'm not using constants link `Taks::Status` because it would break the current `slider_field_tag` implementation. 

Looks like forum topics also use the slider and `AccessLevels`, I will still take a look at it.


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