diff --git a/app/views/dev.py b/app/views/dev.py
index 43e846e1..c08eb558 100644
--- a/app/views/dev.py
+++ b/app/views/dev.py
@@ -9,7 +9,7 @@ from webodm import settings
 from django.http import JsonResponse
 from django.utils.translation import get_language
 import requests
-import json, tempfile, os, logging, shutil, subprocess, zipfile, glob
+import json, tempfile, os, logging, shutil, subprocess, zipfile, glob, pathlib
 
 logger = logging.getLogger('app.logger')
 
@@ -20,6 +20,17 @@ def download_file(url, destination):
         for chunk in download_stream.iter_content(4096):
             fd.write(chunk)
 
+def copymerge(src, dst, symlinks=False, ignore=None):
+    for item in os.listdir(src):
+        s = os.path.join(src, item)
+        d = os.path.join(dst, item)
+        if os.path.isdir(s):
+            pathlib.Path(d).mkdir(parents=True, exist_ok=True)
+            copymerge(s, d, symlinks, ignore)
+        else:
+            shutil.copy2(s, d)
+
+
 @user_passes_test(lambda u: u.is_superuser)
 def dev_tools(request, action):
     if not settings.DEV:
@@ -43,20 +54,19 @@ def dev_tools(request, action):
                     zip.extractall(path=tmpPath)
                 os.unlink(tmpzipPath)
                                 
-                locale_path = glob.glob(os.path.join(tmpPath, "**", "locale"), recursive=True)
-                if len(locale_path) != 1:
+                locale_paths = glob.glob(os.path.join(tmpPath, "**", "locale"), recursive=True)
+                if len(locale_paths) == 0:
                     raise Exception(_("Cannot find locale/ folder in .zip archive"))
                 
-                locale_path = locale_path[0]
-                logger.info("Found locale at %s" % locale_path)
-
                 webodm_locale_dir = os.path.join(settings.BASE_DIR, "locale")
+                if os.path.isdir(webodm_locale_dir):
+                    logger.info("Removing %s" % webodm_locale_dir)
+                    shutil.rmtree(webodm_locale_dir)
 
-                logger.info("Removing %s" % webodm_locale_dir)
-                shutil.rmtree(webodm_locale_dir)
-
-                logger.info("Moving %s to %s..." % (locale_path, os.path.join(settings.BASE_DIR, "locale")))
-                shutil.move(locale_path, settings.BASE_DIR)
+                for locale_path in locale_paths:
+                    logger.info("Found locale at %s" % locale_path)
+                    logger.info("Moving %s to %s..." % (locale_path, webodm_locale_dir))
+                    copymerge(locale_path, webodm_locale_dir)
 
                 logger.info("Running translate.sh extract && translate.sh build safe")
                 translate_script = os.path.join(settings.BASE_DIR, 'translate.sh')
diff --git a/start.sh b/start.sh
index 8bb75acb..dc2a81f2 100755
--- a/start.sh
+++ b/start.sh
@@ -50,6 +50,9 @@ if [ "$1" = "--setup-devenv" ] || [ "$2" = "--setup-devenv" ]; then
     echo Setup pip requirements...
     pip install -r requirements.txt
 
+    echo Build translations...
+    ./translate.sh build safe
+
     echo Setup webpack watch...
     webpack --watch &
 fi