update documentation

config/locales/en.yml

@@ -279,7 +279,12 @@ en:
   save: "Save"
   saved: "Saved."
   saved_error: "Error while saving data."
+  search: "search"
+  search_by_tag: "Search by tag"
+  search_by_username: "Search by username"
   search_empty: "No search results were found."
+  search_input_tag: "Enter tag"
+  search_input_username: "Enter username"
   secure_signin: "Secure Sign In"
   select_file: "Please choose a file to upload."
   signin: "Sign In"