Use verb when possible instead of "OK" for buttons

src/qml/Chat/ClearMessagesPopup.qml

@@ -7,6 +7,7 @@ HBoxPopup {
         "The messages will only be removed on your side. " +
         "They will be available again after you restart the application."
     )
+    okText: qsTr("Clear")
     box.focusButton: "ok"
 
     onOk: py.callClientCoro(userId, "clear_events", [roomId])

src/qml/Pages/EditAccount/ImportExportKeys.qml

@@ -63,6 +63,8 @@ HBox {
 
         id: exportPasswordPopup
         details.text: qsTr("Please enter a passphrase to protect this file:")
+        okText: qsTr("Export")
+
         onAcceptedPasswordChanged:
             encryptionUI.exportKeys(file, acceptedPassword, exportButton)
     }
@@ -82,6 +84,8 @@ HBox {
         details.text: qsTr(
             "Please enter the passphrase that was used to protect this file:"
         )
+        okText: qsTr("Import")
+
         onAcceptedPasswordChanged:
             encryptionUI.importKeys(file, acceptedPassword)
     }