tdf#100726 Improve readability of OUString concatination

concat string in module i18npool to improve readability

Change-Id: I7f447d64703cf5eb07742329ff2656f67214898b
Reviewed-on: https://gerrit.libreoffice.org/29206Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>

i18npool/source/localedata/LocaleNode.cxx

@@ -723,13 +723,7 @@ void LCFormatNode::generateCode (const OFileWriter &of) const
             OUString aKey( aUsage + "," + aType);
             if (!aDefaultsSet.insert( aKey).second)
             {
-                OUString aStr(  "Duplicated default for usage=\"");
-                aStr += aUsage;
-                aStr += "\" type=\"";
-                aStr += aType;
-                aStr += "\": formatindex=\"";
-                aStr += aFormatIndex;
-                aStr += "\".";
+                OUString aStr = "Duplicated default for usage=\"" + aUsage + "\" type=\"" + aType + "\": formatindex=\"" + aFormatIndex + "\".";
                 incError( aStr);
             }
         }