Add rails-i18n gem
Add rails-i18n gem

rails-i18n contains translations for some of the strings we use in
our application. This effectively would lead to us having to translate
less strings for a fully localized application.

Also, adding this gem would automatically resolve some of the tracebacks
which would occur in the webui, once the ui language is changed from
english to something else.

An example UI traceback:

Error caught: [I18n::MissingTranslationData] translation missing:
it.number.human.storage_units.format
gems/i18n-0.6.11/lib/i18n.rb:314:in `handle_exception'
gems/i18n-0.6.11/lib/i18n.rb:160:in `translate'
gems/rails-8f014fba21f9/actionpack/lib/action_view/helpers/number_helper.rb:445:in
`number_to_human_size'
vmdb/config/initializers/av_number_helper.rb:6:in
`block in number_to_human_size_with_negatives'
vmdb/config/initializers/av_number_helper.rb:84:in
`handling_negatives'
vmdb/config/initializers/av_number_helper.rb:5:in
`number_to_human_size_with_negatives'
vmdb/config/initializers/av_number_helper.rb:13:in
`number_to_human_size_with_significant_override'
vmdb/app/models/miq_report/formatting.rb:127:in
`format_bytes_to_human_size'

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