Accepting cash payments/cleaning/doc
[wip] cash import
Cash import/export - ugly
Code refactoring and documentation
'ot cash' cleaning, refactorind, doc
[doc] updated commands documentation
[doc] 'ot payments discard'
[wip] Translation module for otshell
Language set command [wip] hinting, help can be translated now
Functional language module
add command payment discard
Escaping handle with special characters, server contract check
Merge pull request #1 from da2ce7/master

Cherry-Pick latest work.