ASCII-8BIT characters cause errors when using Uglifier

When using Uglifier to compress the code for example in an asset pipeline the following error occurs `Uglifier - "\xE2" from ASCII-8BIT to UTF-8`.

This is due to the usage of the left/right arrows characters and the dots in the comment next to the dots option and the file is encoded as ASCII-8BIT.

This can be fixed by removing the dots from the comment string and using html entities for the arrows instead.

IMO using html entities for the arrows is the safer anyway. NB: the dot characters in the comment also caused the error which is why I just replaced it with the word "dots"