jQuery.i18n.properties is useful library based on jQuery. You can use it to load .properties files with localization to web application.
I made upgrade of jQuery in my application from version 1.6.2 and application failed with error:
Uncaught SyntaxError: Unexpected token ILLEGAL
I spent some time debugging jQuery and i18n and I found out that one of .properties file contains weird property with name:
1_guide=1 guide
Problem was in numeric prefix. Solution is quite easy: fix property.
one_guide=1 guide
This problem occurs when you upgrade jQuery to 1.6.3 and higher.