core: update Japanese translations
Merge pull request #161 from l/translation_ja

core: update Japanese translations
core: make argument "errors" optional in function string_replace_with_callback
core: updated polish translations
doc: update Polish auto-generated files
core: separate new features and bugs fixed in ChangeLog
tests: add tests of function string_replace_with_callback
irc: use irc_protocol_nick_address for ban/quiet/invex/exception lists