Fix anchor text not translated in ie8

Related #49 that I believe is caused by angular/angular.js#1949 / angular/angular.js#2013

This updates the code to remove the `<!--IE fix-->` comment if it is found at the end of the string being translated. 

This would not fix a string containing a link such as `<p translate>This <a>link</a> would not get fixed</p>`.