Improved Frequent Posting and #MIFOSX-1333

Issues Solved: 
1. Incorrect label for “Add Journal Entry” should be “Frequent Posting”
2. Payment Type is not a required field, should be moved under “Show payment details”
3. Move transaction date above Show payment Details
4. Increase comment text area size
5. Currency dropdown first option selected by default
6. Journal entry specific comments (cleaning up debits and credits addition) are same as those listed below

JIRA - https://mifosforge.jira.com/browse/MIFOSX-1370