Closes #2553 - wrap_content for header text for RTL

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

@@ -23,7 +23,7 @@
 
     <TextView
             android:id="@+id/collections_header_text"
-            android:layout_width="match_parent"
+            android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/collections_header"
             android:textAppearance="@style/HeaderTextStyle"

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

@@ -12,7 +12,7 @@
 
     <TextView
         android:id="@+id/header_text"
-        android:layout_width="match_parent"
+        android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginStart="4.5dp"
         android:text="@string/tab_header_label"