Highlight should be accent insensitive

[sarioglu]

Hi,

Currently Highlight component works as case insensitive. This does not work as expected with non-ASCII characters. For example, in Turkish iİ and ıI are different characters. Therefore following example does not highlight anything. This is because case insensitivity assumes i should match I, not İ. Similar examples can be given from other languages as well.

<Highlight highlight="ing">İngilizce (English)</Highlight>

I think it should work accent insensitive by default (as it is already case insensitive), or it should at least be an option. What do you think? I can create the PR if this is approved as a feature.

[rtivital]

You are welcome to submit a PR with this feature

[sarioglu]

Thanks! I submitted a PR: #8890 Please let me know if you need further improvements/tests.