Migrate "translate" command

Makefile

@@ -21,12 +21,6 @@ postgresql:
 	sudo apt-get install postgresql postgresql-contrib libpq-dev
 	pip3 install psycopg2
 
-# Update translation files
-translate:
-	cd InvenTree && python3 manage.py makemessages
-	cd InvenTree && python3 manage.py compilemessages
-
-
 # Install packages required to generate code docs
 docreqs:
 	pip3 install -U -r docs/requirements.txt

tasks.py

@@ -145,6 +145,18 @@ def update(c):
     """
     pass
 
+@task
+def translate(c):
+    """
+    Regenerate translation files.
+
+    Run this command after added new translatable strings,
+    or after adding translations for existing strings.
+    """
+
+    manage(c, "makemigrations")
+    manage(c, "compilemessages")
+
 @task
 def style(c):
     """