Updated README.md for 1.5.x

Tada!  Here it is!  :)
Updated remaining localizations to 1.5

cy_GB; fr_FR; it_IT; la_IT; la_IT; nl_NL; pl+PL; pt_BR; sk_SK; sr_RS;
sv_SE; zh_CN; zh_TW.
This time, my changes to the files weren't the same-I was in a hurry.
Might have missed some.
OCD Localization update

Format is now Language  (abbreviation) Localization File.
Got rid of newlines-currently, a localization file is up-to-date if it
contains 52 lines.
Merge pull request #302 from 50Wliu/Localization

Localization Updates