Bump i18n from 0.6.0 to 0.6.8

[dependabot[bot]]

Bumps i18n from 0.6.0 to 0.6.8.

Commits

• 0de3724 Tweak a few test descriptions
• 61f975b Bump version to 0.6.8
• 16904a7 Fix a naming clash between I18n.enforce_available_locales and I18n.config.enf...
• 95ae5a8 Bump version to 0.6.7
• 88b643e I18n.enforce_available_locales delegates to
• 68498aa Replace CGI.escape_html with CGI.escapeHTML which also exists in 1.8.7
• 86018ad Remove reference to non exisiting CHANGELOG in the gemspec
• 0475a22 Bump version to 0.6.6
• 3b6e56e Add I18n.locale_available? and enforce available locales
• 92b57b1 The I18n::MissingTranslation exception escapes key names for its html_message
• Additional commits viewable in compare view

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