Problem:
Lots of stuff does not need any translation, so we simply leave it untranslated (e.g. firstname shows as Firstname). But this leaves ugly “missing translation” spans in out html.
Instead of entering senseless translations for everything thats missing, we simply deactivate the tooltips in production, while also avoiding raising/rescuing theses MissingTranslation errors to improve performance(rescue/raise is not cheap).
Code:
# https://grosser.it/2012/02/04/do-not-show-i18n-missing-translation-tooltips-in-production/
# config/initializers/disable_i18n_tooltips.rb
# missing translations
# - Do not show tooltips in production/test
# - Do not raise ( speedup) for every missing translations
I18n::Backend::Base.class_eval do
def translate_with_default(locale, key, options = {})
if options[:rescue_format] == :html && ['test','production'].include?(Rails.env)
default = key.to_s.gsub('_', ' ').gsub(/\b('?[a-z])/) { $1.capitalize }
options.reverse_merge!(default: default)
end
translate_without_default(locale, key, options)
end
alias_method_chain :translate, :default
end
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Michael Grosser, the Blog 
Thank you for this good solution, you helped me a lot.
many thanks for this solution it helped me alot translating my current project
but it is missing one trick
the default variable should be only the last word of translatation part
so we need to add one line after declare defualt variable
default = default.split(“.”).last
###########################################################
so the whole code will be
I18n::Backend::Base.class_eval do
def translate_with_default(locale, key, options = {})
if options[:rescue_format] == :html && [‘test’,’production’,’development’].include?(Rails.env)
default = key.to_s.gsub(‘_’, ‘ ‘).gsub(/\b(‘?[a-z])/) { $1.capitalize }
default = default.split(“.”).last #the new line
options.reverse_merge!(default: default)
end
translate_without_default(locale, key, options)
end
alias_method_chain :translate, :default
end
where we have to write this code