remove unused key in locale

remove unused key in locale

diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index b8ec771..16abec3 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -9,7 +9,6 @@ en:
       title: "Solved"
       allow_accepted_answers: "Allow topic owner and staff to mark a reply as the solution"
       accept_answer: "Select if this reply solves the problem"
-      has_accepted_answer: "This topic has a solution"
       has_no_accepted_answer: "This topic has no solution"
       unaccept_answer: "Unselect if this reply no longer solves the problem"
       accepted_answer: "Solution"

GitHub sha: b1682574