devfront i18n 미적용 및 placeholer 번역값 수정

devfront/src/features/clients/ClientGeneralPage.tsx

@@ -305,11 +305,19 @@ function ClientGeneralPage() {
                   <ArrowLeft className="h-4 w-4" />
                 </Link>
               </Button>
-              <h1 className="text-3xl font-black leading-tight">
-                {isCreate
-                  ? t("ui.dev.clients.general.title_create", "Create Client")
-                  : t("ui.dev.clients.general.title_edit", "Client Settings")}
-              </h1>
+              <div>
+                <h1 className="text-3xl font-black leading-tight">
+                  {isCreate
+                    ? t("ui.dev.clients.general.title_create", "Create Client")
+                    : t("ui.dev.clients.general.title_edit", "Client Settings")}
+                </h1>
+                <p className="text-muted-foreground">
+                  {t(
+                    "ui.dev.clients.general.subtitle",
+                    "앱 정보, 권한 스코프, 보안 설정을 관리합니다.",
+                  )}
+                </p>
+              </div>
             </div>
           </div>
           {!isCreate && (