diff --git a/src/apps.js b/src/apps.js
index 3a2503260..cb99206d1 100644
--- a/src/apps.js
+++ b/src/apps.js
@@ -2460,10 +2460,12 @@ async function createExec(app, options) {
         // When passing binary data, tty must be disabled. In addition, the stdout/stderr becomes a single
         // unified stream because of the nature of a tty (see https://github.com/docker/docker/issues/19696)
         Tty: options.tty,
-        Cmd: cmd,
-        Env: [ 'LANG=C.UTF-8' ]
+        Cmd: cmd
     };
 
+    // currently the webterminal and cli sets C.UTF-8
+    if (options.lang) createOptions.Env = [ 'LANG=' + options.lang ];
+
     return await docker.createExec(app.containerId, createOptions);
 }
 
diff --git a/src/routes/apps.js b/src/routes/apps.js
index ccd05e023..4c7dece05 100644
--- a/src/routes/apps.js
+++ b/src/routes/apps.js
@@ -728,9 +728,11 @@ async function createExec(req, res, next) {
     if ('tty' in req.body && typeof req.body.tty !== 'boolean') return next(new HttpError(400, 'tty must be boolean'));
     const tty = !!req.body.tty;
 
+    if ('lang' in req.body && typeof req.body.lang !== 'string') return next(new HttpError(400, 'lang must be a string'));
+
     if (safe.query(req.app, 'manifest.addons.docker') && req.user.role !== users.ROLE_OWNER) return next(new HttpError(403, '"owner" role is requied to exec app with docker addon'));
 
-    const [error, id] = await safe(apps.createExec(req.app, { cmd, tty }));
+    const [error, id] = await safe(apps.createExec(req.app, { cmd, tty, lang: req.body.lang }));
     if (error) return next(BoxError.toHttpError(error));
 
     next(new HttpSuccess(200, { id }));