Localization and theme support.

MiniScanner/Common/AppTabBarController.swift

@@ -122,8 +122,7 @@ class AppTabBar: UITabBar {
     }
     
     @objc private func setupMiddleButton() {
-        let image = UIImage(named: "add_doc_icon")
-        middleButton.setImage(image, for: UIControl.State.normal)
+        middleButton.setImage(.addDocIcon, for: UIControl.State.normal)
         middleButton.contentVerticalAlignment = .fill
         middleButton.contentHorizontalAlignment = .fill
         middleButton.imageEdgeInsets = .zero