Is your feature request related to a problem? Please describe.

Hello, as described in ROOT-7859, ROOT does not handle UTF8 encoding for characters in the current ROOT version (6.22).

Describe the solution you'd like

It would be really nice to have such support since as shown on the sreenshot here, characters with diacritics (here is the "é" character) are not correctly displayed.
It already exists some workarounds for the graphics (see the forum post) but it does not work in the case of the TBrowser for example.