fix escape double quote in msgid issue

in method push_buffer, gsub will NOT modify the original string object, use gsub! instead

lib/po_to_json.rb

@@ -168,7 +168,7 @@ def assign_trans
 
   def push_buffer(value, key = nil)
     value = $1 if value =~ /^"(.*)"/
-    value.gsub(/\\"/, "\"")
+    value.gsub!(/\\"/, "\"")
 
     if key.nil?
       buffer[lastkey] = [

spec/fixtures/test.po

@@ -67,3 +67,6 @@ msgstr "Du solltest '\\' als '\\\\' escapen."
 
 msgid "Umläüte"
 msgstr "Umlaute"
+
+msgid "contains double quote, say \"Hello\""
+msgstr "contains double quote, say \"Hello\""

spec/po_to_json_spec.rb

@@ -111,6 +111,11 @@
         eq(["Auto"])
       )
     end
+    it "should not espace double quote in msgid" do
+      expect(
+        subject["contains double quote, say \"Hello\""]
+      ).to be_truthy
+    end
   end
 
   describe "generate jed compatible" do