FIX: Add missing strings.

FIX: Add missing strings.

diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index 3ce03ba..22abf10 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -248,6 +248,8 @@ en:
     every_hour: "every hour"
     daily: "daily"
     weekly: "weekly"
+    every_month: "every month"
+    every_six_months: "every six months"
     max_of_count: "max of {{count}}"
     alternation: "or"
     character_count:

GitHub sha: 36a7bfa2