RDISCROWD-7232 country codes update

[n00rsy]

Issue number of the reported bug or feature request: RDISCROWD-7232

Describe your changes

• handle edge cases in mapping between country code to country name
• map throughout application with pybossa.util.map_locations function
• map in task browse page
• new user input form
• refactor
  

Additional context
bloomberg/pybossa-default-theme#452

[coveralls]

Pull Request Test Coverage Report for Build 8941427698

Details

• 39 of 42 (92.86%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.009%) to 93.946%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pybossa/view/account.py	4	7	57.14%

Totals
Change from base Build 8820723911:	0.009%
Covered Lines:	17131
Relevant Lines:	18235

---

💛 - Coveralls