Add script to clean up after Crowdin

Crowdin does not delete files from translations when the main language
has a deleted file.

This script will do that job for them.

clean_translations.py

@@ -0,0 +1,16 @@
+import os
+
+
+files_in_main = []
+
+
+for i in os.listdir("_pages/en_US/"):
+    files_in_main.append(i)
+
+for i in os.listdir("_pages/"):
+    if i == "en_US":
+        continue
+    for j in os.listdir(f"_pages/{i}"):
+        if j not in files_in_main:
+            print(f"Deleting _pages/{i}/{j}")
+            os.remove(f"_pages/{i}/{j}")