How I pass parameter to Thunderbird?

Hello I need to pass a -UILocale pt-BR parameter to thunderbird, how I do these? I try to change in thunderbirdPortable.ini in Other\Source these:

[ThunderbirdPortable]
ThunderbirdDirectory=App\thunderbird
ThunderbirdExecutable=thunderbird.exe
AdditionalParameters=UILocale pt-BR
GPGPathDirectory=App\gpg
ProfileDirectory=Data\profile
PluginsDirectory=Data\plugins
RegistryDirectory=Data\registry
SettingsDirectory=Data\settings
GPGHomeDirectory=Data\gpg
DisableSplashScreen=false
AllowMultipleInstances=false
DisableIntelligentStart=false
SkipChromeFix=false
SkipCompregFix=false
RunLocally=false

but not work. How I do these?

Best Regards,
Fellipe H.