Minor tweaks

- All our other icons do not have bounding boxes, so let's follow that
  scheme as well.
- Changed the name to "Configure Global Security" to make it clear that
  this is a part of the configuration.

core/src/main/java/hudson/security/GlobalSecurityConfiguration.java

@@ -127,7 +127,7 @@ public class GlobalSecurityConfiguration extends ManagementLink {
 
     @Override
     public String getIconFileName() {
-        return "lock.png";
+        return "secure.png";
     }
 
     @Override

core/src/main/resources/hudson/security/GlobalSecurityConfiguration/index.jelly

@@ -20,7 +20,7 @@
 	<l:layout norefresh="true" permission="${app.ADMINISTER}"
 		title="${it.displayName}">
 		<l:main-panel>
-			<h1><img src="${imagesURL}/48x48/lock.png" height="48" width="48" /> ${it.displayName}</h1>
+			<h1><img src="${imagesURL}/48x48/secure.png" height="48" width="48" /> ${it.displayName}</h1>
 			<p>
 			</p>
 			<div class="behavior-loading">${%LOADING}</div>

core/src/main/resources/hudson/security/Messages.properties

@@ -19,7 +19,7 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-GlobalSecurityConfiguration.DisplayName=Global Security
+GlobalSecurityConfiguration.DisplayName=Configure Global Security
 GlobalSecurityConfiguration.Description=Secure Jenkins; define who is allowed to access/use the system.
 
 GlobalMatrixAuthorizationStrategy.DisplayName=Matrix-based security