Add import encoding warning

Author: krystofkomanec

docs/applications/admin-center/import/projects.rst

@@ -9,3 +9,8 @@ As an admin, we can import projects using provided template. The template has fo
     :width: 528
 
     Import projects.
+
+.. WARNING::
+
+    Using Microsoft Excel to edit the template may cause issues with the encoding of the file. If you encounter any issues, please use some other editor to edit the file.
+

docs/applications/admin-center/import/users.rst

@@ -16,3 +16,9 @@ We can also select if we want to send an invitation email or not by :guilabel:`S
 .. figure:: users/users-confirmation.png
 
     Import users confirmation with switch to send invitation email.
+
+
+.. WARNING::
+
+    Using Microsoft Excel to edit the template may cause issues with the encoding of the file. If you encounter any issues, please use some other editor to edit the file.
+