diff --git a/src/_locales/en/messages.json b/src/_locales/en/messages.json
index 48de494..6a27b57 100644
--- a/src/_locales/en/messages.json
+++ b/src/_locales/en/messages.json
@@ -482,10 +482,10 @@
   "lang_ny": {
     "message": "Chewa"
   },
-  "lang_zh-CN": {
+  "lang_zh_CN": {
     "message": "Chinese (Simplified)"
   },
-  "lang_zh-TW": {
+  "lang_zh_TW": {
     "message": "Chinese (Traditional)"
   },
   "lang_co": {
@@ -767,16 +767,16 @@
   "lang_zu": {
     "message": "Zulu"
   },
-  "lang_en-US": {
+  "lang_en_US": {
     "message": "English (American)"
   },
-  "lang_en-GB": {
+  "lang_en_GB": {
     "message": "English (British)"
   },
-  "lang_pt-PT": {
+  "lang_pt_PT": {
     "message": "Portuguese"
   },
-  "lang_pt-BR": {
+  "lang_pt_BR": {
     "message": "Portuguese (Brazilian)"
   },
   "lang_zh": {
diff --git a/src/common/generateLangOptions.js b/src/common/generateLangOptions.js
index ddfdc22..d2c00e1 100644
--- a/src/common/generateLangOptions.js
+++ b/src/common/generateLangOptions.js
@@ -8,7 +8,7 @@ export default (translationApi) => {
   const langList = translationApi === "google" ? langListGoogle : langListDeepl;
   const langOptions = langList.map(lang => ({
     value: lang,
-    name: browser.i18n.getMessage("lang_" + lang)
+    name: browser.i18n.getMessage("lang_" + lang.replace("-", "_"))
   }));
   langOptions.sort(alphabeticallySort);
   return langOptions;