feat: search test case (#277)

frontend/messages/en.json

@@ -209,7 +209,8 @@
     "select_priorities": "Select priorities",
     "selected": "Selected",
     "type": "Type",
-    "select_types": "Select types"
+    "select_types": "Select types",
+    "search_placeholder": "Type to search..."
   },
   "Case": {
     "back_to_cases": "Back to test cases",

frontend/messages/ja.json

@@ -210,7 +210,8 @@
     "select_priorities": "優先度を選択",
     "selected": "選択済み",
     "type": "タイプ",
-    "select_types": "タイプを選択"
+    "select_types": "タイプを選択",
+    "search_placeholder": "入力して検索..."
   },
   "Case": {
     "back_to_cases": "テストケース一覧に戻る",

frontend/messages/pt-BR.json

@@ -209,7 +209,8 @@
     "select_priorities": "Selecionar prioridades",
     "selected": "Selecionado",
     "type": "Tipo",
-    "select_types": "Selecionar tipos"
+    "select_types": "Selecionar tipos",
+    "search_placeholder": "Digite para buscar..."
   },
   "Case": {
     "back_to_cases": "Voltar para os casos de teste",