diff --git a/lang/admin/pt-BR.json b/lang/admin/pt-br.json
similarity index 100%
rename from lang/admin/pt-BR.json
rename to lang/admin/pt-br.json
diff --git a/lang/common/pt-BR.json b/lang/common/pt-br.json
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rename from lang/common/pt-BR.json
rename to lang/common/pt-br.json
diff --git a/lang/email/pt-BR.json b/lang/email/pt-br.json
similarity index 100%
rename from lang/email/pt-BR.json
rename to lang/email/pt-br.json
diff --git a/lang/form/pt-BR.json b/lang/form/pt-br.json
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rename from lang/form/pt-BR.json
rename to lang/form/pt-br.json
diff --git a/lang/setup/de-DE.json b/lang/setup/de-de.json
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rename from lang/setup/de-DE.json
rename to lang/setup/de-de.json
diff --git a/lang/setup/fr-FR.json b/lang/setup/fr-fr.json
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rename from lang/setup/fr-FR.json
rename to lang/setup/fr-fr.json
diff --git a/lang/setup/nl-NL.json b/lang/setup/nl-nl.json
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rename from lang/setup/nl-NL.json
rename to lang/setup/nl-nl.json
diff --git a/lang/setup/pt-BR.json b/lang/setup/pt-br.json
similarity index 100%
rename from lang/setup/pt-BR.json
rename to lang/setup/pt-br.json