feat(i18n): 메시지 모듈 하드코딩 문구를 I18n 키로 통일한다

SodaLive/Sources/Message/Text/SelectRecipient/SelectRecipientView.swift

@@ -18,11 +18,11 @@ struct SelectRecipientView: View {
     var body: some View {
         BaseView {
             VStack(spacing: 20) {
-                DetailNavigationBar(title: String(localized: "받는 사람 검색")) {
+                DetailNavigationBar(title: I18n.Message.Text.SelectRecipient.title) {
                     isShowing = false
                 }
                 
-                TextField("닉네임을 입력해주세요", text: $viewModel.searchNickname)
+                TextField(I18n.Message.Text.SelectRecipient.nicknamePlaceholder, text: $viewModel.searchNickname)
                     .autocapitalization(.none)
                     .disableAutocorrection(true)
                     .appFont(size: 13.3, weight: .medium)