Fix fa strings and test layout direction

V2rayNG/app/src/main/res/layout/activity_main.xml

@@ -50,7 +50,7 @@
                         android:layout_width="match_parent"
                         android:layout_height="@dimen/connection_test_height"
                         android:background="?attr/colorPrimary"
-                        android:gravity="center|left"
+                        android:gravity="center|start"
                         android:nextFocusRight="@+id/fab"
                         android:clickable="true"
                         android:focusable="true"