As t6d said you need to add is/are to the Rails inflector. Just the code from td6, but you need to add the ActiveSupport namespace:
ActiveSupport::Inflector.inflections do |inflection|
inflection.irregular "is", "are"
end
Now the helper Rails has built in is pluralize, but in a view that won't do what you want.
For example:
pluralize(@leads.length,'is')
outputs (for 2 leads)
2 are
For what you want you need to make your own helper that will pluralize the word, but not output the count. So if you base it on the current rails pluralize:
def pluralize_no_count(count, singular, plural = nil)
((count == 1 || count == '1') ? singular : (plural || singular.pluralize))
end