diff --git a/lang/admin/el-GR.json b/lang/admin/el-gr.json
similarity index 100%
rename from lang/admin/el-GR.json
rename to lang/admin/el-gr.json
diff --git a/lang/admin/id-ID.json b/lang/admin/id-id.json
similarity index 100%
rename from lang/admin/id-ID.json
rename to lang/admin/id-id.json
diff --git a/lang/common/el-GR.json b/lang/common/el-gr.json
similarity index 100%
rename from lang/common/el-GR.json
rename to lang/common/el-gr.json
diff --git a/lang/common/id-ID.json b/lang/common/id-id.json
similarity index 100%
rename from lang/common/id-ID.json
rename to lang/common/id-id.json
diff --git a/lang/email/el-GR.json b/lang/email/el-gr.json
similarity index 100%
rename from lang/email/el-GR.json
rename to lang/email/el-gr.json
diff --git a/lang/email/id-ID.json b/lang/email/id-id.json
similarity index 100%
rename from lang/email/id-ID.json
rename to lang/email/id-id.json
diff --git a/lang/form/el-GR.json b/lang/form/el-gr.json
similarity index 100%
rename from lang/form/el-GR.json
rename to lang/form/el-gr.json
diff --git a/lang/form/id-ID.json b/lang/form/id-id.json
similarity index 100%
rename from lang/form/id-ID.json
rename to lang/form/id-id.json
diff --git a/lang/setup/el-GR.json b/lang/setup/el-gr.json
similarity index 100%
rename from lang/setup/el-GR.json
rename to lang/setup/el-gr.json
diff --git a/lang/setup/id-ID.json b/lang/setup/id-id.json
similarity index 100%
rename from lang/setup/id-ID.json
rename to lang/setup/id-id.json