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.
Replaced "Windows 7"/"Windows 8" with "windows" osfamily for Windows versions other than 7/8 and replace "Linux"/"Mac OS X" with "unix" osfamily for Unix OSes that aren't Linux/Mac.
Added in support for auto-incrementing build numbers into the build script (and code). A nicer way to track what version folks have :)