diff --git a/src/lang/bg.js b/src/lang/bg.js
index 8971bcf..b781008 100644
--- a/src/lang/bg.js
+++ b/src/lang/bg.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "ltr"
diff --git a/src/lang/es.js b/src/lang/es.js
index 8d86cc7..33932db 100644
--- a/src/lang/es.js
+++ b/src/lang/es.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "ltr"
diff --git a/src/lang/fa.js b/src/lang/fa.js
index f5b9172..df7b0eb 100644
--- a/src/lang/fa.js
+++ b/src/lang/fa.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "rtl"
diff --git a/src/lang/fr.js b/src/lang/fr.js
index d198416..dc4b1ad 100644
--- a/src/lang/fr.js
+++ b/src/lang/fr.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "ltr"
diff --git a/src/lang/gl.js b/src/lang/gl.js
index 5369f23..b683aa8 100644
--- a/src/lang/gl.js
+++ b/src/lang/gl.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "ltr"
diff --git a/src/lang/it.js b/src/lang/it.js
index 6e6504e..afe66b5 100644
--- a/src/lang/it.js
+++ b/src/lang/it.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "ltr"
diff --git a/src/lang/ms.js b/src/lang/ms.js
index 41ff5d1..da38b43 100644
--- a/src/lang/ms.js
+++ b/src/lang/ms.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "ltr"
diff --git a/src/lang/ru.js b/src/lang/ru.js
index 08d8431..ba5f4f0 100644
--- a/src/lang/ru.js
+++ b/src/lang/ru.js
@@ -1,5 +1,7 @@
 const data = {...require("./base")}
 const {pug} = require("./utils/functions")
+const constants = require("../lib/constants")
+if (!constants.language_dev) Object.assign(data, require("./en.js"))
 
 ;(() => {
 	data.meta_direction = "ltr"
diff --git a/src/lib/constants.js b/src/lib/constants.js
index 768623d..6f1f164 100644
--- a/src/lib/constants.js
+++ b/src/lib/constants.js
@@ -290,7 +290,10 @@ let constants = {
 	additional_routes: [],
 
 	database_version: 10,
-	actually_backup_on_database_upgrade: true
+	actually_backup_on_database_upgrade: true,
+
+	// enable this to display: "MISSING STRING: string_id" instead of the English version for all untranslated strings
+	language_dev: false
 }
 
 // Override values from config and export the result