Fix categories title text

- should not be all caps any more

See bug #13140648 Settings needs to support the new Quantum Paper theme

Change-Id: I612de65539a02a65a7b760d53fb04290b6b596cf
diff --git a/res/values/strings.xml b/res/values/strings.xml
index b1df535..6b5ff84 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -44,13 +44,13 @@
 
     <!-- Category headings in left-pane header menu --> <skip />
     <!-- Settings main menu category heading. Wireless and networks (Wi-Fi, Bluetooth, data usage...). [CHAR LIMIT=40] -->
-    <string name="header_category_wireless_networks">WIRELESS &amp; NETWORKS</string>
+    <string name="header_category_wireless_networks">Wireless &amp; Networks</string>
     <!-- Settings main menu category heading. Device (Sound, display, battery, applications...). [CHAR LIMIT=40] -->
-    <string name="header_category_device">DEVICE</string>
+    <string name="header_category_device">Device</string>
     <!-- Settings main menu category heading. Personal (Accounts, security, language, backup...). [CHAR LIMIT=40] -->
-    <string name="header_category_personal">PERSONAL</string>
+    <string name="header_category_personal">Personal</string>
     <!-- Settings main menu category heading. System (Updates, data, accessibility, about phone). [CHAR LIMIT=40] -->
-    <string name="header_category_system">SYSTEM</string>
+    <string name="header_category_system">System</string>
 
     <!-- Phone info -->
     <!-- Phone Info screen. Button label to turn on the radio . Only shown in diagnostic screen, so precise translation is not needed. -->