Using set_translation_for_key in JQuery formatter to transform the value instead of read_file.

lib/twine/formatters/jquery.rb

@@ -25,6 +25,11 @@ module Twine
         return
       end
 
+      def set_translation_for_key(key, lang, value)
+        value = value.gsub("\n","\\n")
+        super(key, lang, value)
+      end
+
       def read_file(path, lang)
         begin
           require "json"
@@ -35,7 +40,6 @@ module Twine
         open(path) do |io|
           json = JSON.load(io)
           json.each do |key, value|
-            value = value.gsub("\n","\\n")
             set_translation_for_key(key, lang, value)
           end
         end

test/test_formatters.rb

@@ -132,6 +132,12 @@ class TestJQueryFormatter < FormatterTest
     end
   end
 
+  def test_set_translation_escapes_newlines
+    @formatter.set_translation_for_key 'key1', 'en', "new\nline"
+
+    assert_equal 'new\nline', @strings.strings_map['key1'].translations['en']
+  end
+
   def test_write_file_output_format
     formatter = Twine::Formatters::JQuery.new @twine_file, {}
     formatter.write_file @output_path, 'en'