in fix_umlauts() we substitute english-alphabet-chars instead of removing i18n chars.

This solves the following problem:

Faker::Config.locale = "ja"
Faker::Internet.safe_email            # => "@example.com"
Faker::Config.locale = "ko"
Faker::Internet.safe_email             # => "_@example.org"

end result is not very {insert i18n country here} sounding, but it's important to generate valid email addresses as a first step.