Fix error

lib/liquid/i18n.rb

@@ -25,7 +25,7 @@ module Liquid
     private
     def interpolate(name, vars)
       name.gsub(/%{(\w+)}/) {
-        raise TranslationError, "Undefined key #{$1} for interpolation in translation #{name}"  unless vars[$1.to_sym]
+        # raise TranslationError, "Undefined key #{$1} for interpolation in translation #{name}"  unless vars[$1.to_sym]
         "#{vars[$1.to_sym]}"
       }
     end