Merge branch 'impact_missions' of github.com:Useful-Inc/big-help-mob-webapp into impact_missions
extract label texts to locals files.

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load complete missions.

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load members of a league.

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add simple style for complete missions page.

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progress on Leagues Front Page
Frontend & Backend merged
load tabs page from back end instead of using js.

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fix LEAGUE MEMBERS in complete missions tab.

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add content for upcoming missions tab

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refactor: pages in league show page

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add styles for league tab.

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add styles for upcoming missions tab.

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add style for complete missions page.

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add style for members tab.

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fix style when user is not a member of a league.

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show members of the league in the complete missions tab page.

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add memebers attending for upcoming missions.

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fix layout issue for league control part.

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fix syntax error in _mission_feedback.html.haml.

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