add a external link icon to viaf links, correct bug #27355 (https://mantis.culture.fr/mantis/view.php?id=27355)
# EditorConfig helps developers define and maintain consistent
# coding styles between different editors and IDEs
# editorconfig.org
root = true
[*]
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true
indent_style = space
indent_size = 2
[*.js]
indent_style = space
indent_size = 2
[*.hbs]
insert_final_newline = false
indent_style = space
indent_size = 2
[*.css]
indent_style = space
indent_size = 2
[*.html]
indent_style = space
indent_size = 2
[*.{diff,md}]
trim_trailing_whitespace = false