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Subject
I am targeting this branch, because this is BC break on 3.x.
Part of #7049
I Upgraded to font awesome 5, but keeping a compatibility layer with version 4. On this bundle I have replaced all icons with its new version, but other sonata bundles will still use the old icon names until upgraded, this ensure it will still work.
Followed this guide: https://fontawesome.com/how-to-use/on-the-web/setup/upgrading-from-version-4
And check the icon exist here: https://fontawesome.com/icons?d=gallery&p=2
I just used the 'fas' and 'fab' prefix, because thats the only "free" part, rest of icons are paid (there are some far that are not paid but not used them)
Changelog