refactor: priority messages duplication

frontend/messages/en.json

@@ -133,11 +133,7 @@
     "destructive": "Destructive",
     "regression": "Regression",
     "automated": "Automated",
-    "manual": "Manual",
-    "critical": "Critical",
-    "high": "High",
-    "medium": "Medium",
-    "low": "Low"
+    "manual": "Manual"
   },
   "Folders": {
     "folder": "Folder",
@@ -166,10 +162,6 @@
     "are_you_sure": "Are you sure you want to delete test cases?",
     "new_test_case": "New Test Case",
     "status": "Status",
-    "critical": "Critical",
-    "high": "High",
-    "medium": "Medium",
-    "low": "Low",
     "no_cases_found": "No test cases found",
     "case_title": "Test Case Title",
     "case_description": "Test Case Description",
@@ -186,10 +178,6 @@
     "description": "Description",
     "test_case_description": "Test case description",
     "priority": "Priority",
-    "critical": "Critical",
-    "high": "High",
-    "medium": "Medium",
-    "low": "Low",
     "type": "Type",
     "other": "Other",
     "security": "Security",
@@ -264,10 +252,6 @@
     "priority": "Priority",
     "status": "Status",
     "actions": "Actions",
-    "critical": "Critical",
-    "high": "High",
-    "medium": "Medium",
-    "low": "Low",
     "untested": "Untested",
     "passed": "Passed",
     "failed": "Failed",

frontend/messages/ja.json

@@ -134,11 +134,7 @@
     "destructive": "破壊",
     "regression": "回帰",
     "automated": "自動",
-    "manual": "手動",
-    "critical": "致",
-    "high": "高",
-    "medium": "中",
-    "low": "低"
+    "manual": "手動"
   },
   "Folders": {
     "folder": "フォルダー",
@@ -167,10 +163,6 @@
     "are_you_sure": "テストケースを削除してもよろしいですか?",
     "new_test_case": "新規テストケース",
     "status": "ステータス",
-    "critical": "致",
-    "high": "高",
-    "medium": "中",
-    "low": "低",
     "no_cases_found": "テストケースがありません",
     "case_title": "テストケースタイトル",
     "case_description": "テストケース詳細",
@@ -187,10 +179,6 @@
     "description": "詳細",
     "test_case_description": "テストケース詳細",
     "priority": "優先度",
-    "critical": "致",
-    "high": "高",
-    "medium": "中",
-    "low": "低",
     "type": "タイプ",
     "other": "その他",
     "security": "セキュリティ",
@@ -265,10 +253,6 @@
     "priority": "優先度",
     "status": "ステータス",
     "actions": "アクション",
-    "critical": "致",
-    "high": "高",
-    "medium": "中",
-    "low": "低",
     "untested": "未実行",
     "passed": "成功",
     "failed": "失敗",