Bug #1443: Fix gettext keys extractor

Improve the regex taking into account possible spaces to extract the strings in
the Hibernate validation annotations.

Before this patch only the next lines would be marked to be translated:
    @NotNull(message="code not specified"

However, next line has to be marked to be translated too:
    @NotNull(message = "code not specified")

FEA: ItEr76S04BugFixing

scripts/gettext-keys-generator.pl

@@ -279,7 +279,7 @@ sub parse_hibernate_validations()
             next;
         }
         # First line
-        if ($line =~ /\@\w+\(message=\"(.*?)\"/) {
+        if ($line =~ /\@\s*\w+\s*\(\s*message\s*=\s*\"(.*?)\s*\"/) {
             $msgid = "\"$1\"";
             # Line ends with a )
             if ($line =~ /\)\s*$/) {