Add sist2-admin, update Dockerfile & docker-compose

sist2-admin/sist2_admin/tesseract.py

@@ -0,0 +1,14 @@
+import subprocess
+
+
+def get_tesseract_langs():
+
+    res = subprocess.check_output([
+        "tesseract",
+        "--list-langs"
+    ]).decode()
+
+    languages = res.split("\n")[1:]
+
+    return list(filter(lambda lang: lang and lang != "osd", languages))
+