Let's calm down and end message with a period

Change-Id: I14bbb49e7d7200785b0fb812b9719d030987cbc5
Reviewed-on: https://gerrit.libreoffice.org/60845
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

officecfg/registry/data/org/openoffice/Office/PresentationMinimizer.xcu

@@ -197,7 +197,7 @@ The current presentation contains no OLE objects.</value>
             <value xml:lang="en-US">.</value>
         </prop>
         <prop oor:name="STR_ERROR_IO">
-            <value xml:lang="en-US">Writing output file failed!</value>
+            <value xml:lang="en-US">Writing output file failed.</value>
         </prop>
     </node>
     <node oor:name="LastUsedSettings">

officecfg/registry/schema/org/openoffice/Office/PresentationMinimizer.xcs

@@ -363,7 +363,7 @@ The current presentation contains no OLE objects.</value>
 			</prop>
 			<prop oor:name="STR_ERROR_IO" oor:type="xs:string" oor:localized="true">
 		<info><desc>String STR_ERROR_IO.</desc></info>
-				<value>Writing output file failed!</value>
+				<value>Writing output file failed.</value>
 			</prop>
 		</group>
 		<node-ref oor:name="LastUsedSettings" oor:node-type="OptimizerSettings">