Only English and Czech locales are now allowed

- Any other locale will be considered English.
- I used Grails Locale Configuration Plugin to make it easier for me.

grails-app/conf/BuildConfig.groovy

@@ -79,6 +79,7 @@ grails.project.dependency.resolution = {
         compile ":lesscss-resources:1.3.1"
         compile ":hibernate-filter:0.3.2"
         compile ":feeds:1.5"
+        compile ':locale-configuration:1.1.1'
         test(":spock:0.7") {
             exclude "spock-grails-support"
         }

grails-app/conf/Config.groovy

@@ -138,6 +138,10 @@ log4j = {
     }
 }
 
+// Locale settings
+grails.plugin.localeConfiguration.supportedLocales = [Locale.US, new Locale("cs")]
+grails.plugin.localeConfiguration.defaultLocale = Locale.US
+
 // Added by the Spring Security Core plugin:
 grails.plugins.springsecurity.userLookup.userDomainClassName = 'com.redhat.theses.auth.User'
 grails.plugins.springsecurity.authority.className = 'com.redhat.theses.auth.Role'