[IMP] web_editor: use unicode number for FontAwesome controller

In some non-usual circumstances, using unicode in controllers can lead
to issue. For example on a terminal using C encoding (instead of the
mighty UTF-8) werkzeug might use sys.getfilesystemencoding to encode the
request URL which will fail with UTF-8 inside.

This commit change the URL character of the font awesome controller to
UTF-8, but keep the old way since every sent mail might still use it.

There is the overlap of character 0 to 9 which are overidden in this
commit by unicode code 0 to 9, but these were not used in font-awesome
anyway (or these are not even visible ASCII characters).

closes #9572

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