Added some entity property comments
FTGP-861 : Added user language property
Removed the old git zip file from the subversion era.
FTGP-627 : Added chart of account language property
FTGP-581 FTGP-815 Property flag for using UTF8 in SIE-import data
FTGP-951 : Added GetLoginRequest to the ApiClient for constructing SSO requests/URL:s
FTGP-955 : Support for updating if the fiscal year is open or closed
Revert "FTGP-581 FTGP-815 Property flag for using UTF8 in SIE-import data"

This reverts commit 2d3b202e42279b38c96df50c23cec794a8d19431 as of description
in FTGP-963
FTGP-966 : Not possible to get a chart of accounts by id
FTGP-967 : Chart of accounts is not properly (de)serialized
FTGP-978 : Fixed URL error in the CompanyKeyFigureDataResource