Problem about ‘Change the CSS Style’ adding “\”

I have seen this thread but it didn’t answer the issue…

As you can see, the orignal input

$buoop = {
text_for_i: {
'msg':'Your browser ({brow_name}) is so damn old! Internet Explorer is not supported anymore and will not work on this website.',
'msgmore': 'Please update your browser as soon as possible.'
}
}

became

$buoop = {
text_for_i: {
\'msg\':\'Your browser ({brow_name}) is so damn old! Internet Explorer is not supported anymore.\',
\'msgmore\': \'Update your browser as soon as possible to use this site.\'
}
}

after clicking ‘Update Settings’ and the CSS change does not take effect.

Will this problem be fixed?