[fix] fix search_user view translation

src/sakia/gui/sub/search_user/view.py

 from PyQt5.QtWidgets import QWidget, QComboBox, QCompleter
-from PyQt5.QtCore import QT_TRANSLATE_NOOP, pyqtSignal, Qt, QStringListModel
+from PyQt5.QtCore import QT_TRANSLATE_NOOP, pyqtSignal, Qt, QStringListModel, QCoreApplication
 from sakia.data.entities import Contact
 from .search_user_uic import Ui_SearchUserWidget
 import re
@@ -12,7 +12,7 @@ class SearchUserView(QWidget, Ui_SearchUserWidget):
     """
 
     _search_placeholder = QT_TRANSLATE_NOOP(
-        "SearchUserWidget", "Research a pubkey, an uid..."
+        "SearchUserView", "Research a pubkey, an uid..."
     )
     search_requested = pyqtSignal(str)
     reset_requested = pyqtSignal()
@@ -23,8 +23,9 @@ class SearchUserView(QWidget, Ui_SearchUserWidget):
         super().__init__(parent)
         self.setupUi(self)
         # Default text when combo lineEdit is empty
+        res = QCoreApplication.translate("SearchUserView", SearchUserView._search_placeholder)
         self.combobox_search.lineEdit().setPlaceholderText(
-            self.tr(SearchUserView._search_placeholder)
+            res
         )
         #  add combobox events
         self.combobox_search.lineEdit().returnPressed.connect(self.search)
@@ -52,7 +53,7 @@ class SearchUserView(QWidget, Ui_SearchUserWidget):
             text = self.combobox_search.lineEdit().text()
         self.combobox_search.lineEdit().clear()
         self.combobox_search.lineEdit().setPlaceholderText(
-            self.tr("Looking for {0}...".format(text))
+            self.tr("Looking for {0}...").format(text)
         )
         self.search_requested.emit(text)