Fix commons-app#2197: Fix color of links on about page in night mode (commons-app#2604)

Author: domdomegg

app/src/main/res/layout/activity_about.xml

@@ -120,7 +120,7 @@
                         android:layout_height="wrap_content"
                         android:layout_marginTop="@dimen/standard_gap"
                         android:gravity="center"
-                        android:textColor="@color/primaryColor"
+                        android:textColor="?attr/colorAccent"
                         />
 
                     <TextView
@@ -129,7 +129,7 @@
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
                         android:layout_marginTop="@dimen/standard_gap"
-                        android:textColor="@color/primaryColor"
+                        android:textColor="?attr/colorAccent"
                         android:gravity="center"
                         />
 
@@ -138,7 +138,7 @@
                         style="?android:textAppearanceSmall"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:textColor="@color/primaryColor"
+                        android:textColor="?attr/colorAccent"
                         android:layout_marginTop="@dimen/standard_gap"
                         android:gravity="center"
                         />
@@ -148,7 +148,7 @@
                         style="?android:textAppearanceSmall"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:textColor="@color/primaryColor"
+                        android:textColor="?attr/colorAccent"
                         android:layout_marginTop="@dimen/standard_gap"
                         android:gravity="center"
                         />
@@ -158,8 +158,9 @@
                         style="?android:textAppearanceSmall"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:textColor="@color/primaryColor"
+                        android:textColor="?attr/colorAccent"
                         android:layout_marginTop="@dimen/standard_gap"
+                        android:layout_marginBottom="@dimen/standard_gap"
                         android:gravity="center"
                         />