Added reverse cancel/confirm action preference string & description, added into PreferenceScreen under reverse_days option.

uhabits-android/src/main/res/values/strings.xml

@@ -147,6 +147,8 @@
     <string name="interface_preferences">Interface</string>
     <string name="reverse_days">Reverse order of days</string>
     <string name="reverse_days_description">Show days in reverse order on the main screen.</string>
+    <string name="reverse_cancel_confirm_action">Reverse cancel / confirm action</string>
+    <string name="reverse_cancel_confirm_action_description">Reverse order of buttons when confirming or cancelling entry on a habit.</string>
     <string name="day">Day</string>
     <string name="week">Week</string>
     <string name="month">Month</string>

uhabits-android/src/main/res/xml/preferences.xml

@@ -60,6 +60,14 @@
                 app:iconSpaceReserved="false" />
 
 
+        <SwitchPreferenceCompat
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:defaultValue="false"
+            android:key="pref_checkmark_reverse_cancel_confirm"
+            android:summary="@string/reverse_cancel_confirm_action_description"
+            android:title="@string/reverse_cancel_confirm_action"
+            app:iconSpaceReserved="false" />
         <SwitchPreferenceCompat
                 android:defaultValue="false"
                 android:key="pref_pure_black"