1) submitting log: added getChatEntry and sendWordLog
2) sayCurrentExplanation (for repeat button)
3) onNextExplanationButtonClick (for next button)
4) Toasts with correctWord (when finishing) and right/wrong user answers
5) some functions refactoring
Merge pull request #4 from kuzmichevdima/master

1) submitting log: added getChatEntry and sendWordLog