diff --git a/config/locales/en.yml b/config/locales/en.yml
index 196285b..9e8fa4a 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -4,6 +4,9 @@ en:
     personal_conference: Conference Paper 
 
   personal_conference:
+    select_class: "——select class——"
+    search_class: "search class:"
+    word_to_search: "word to search:"
     year : "Year"
     language : "Language"
     paper_title : "Paper Title"