Add translation for uploading 3D images

backend/en/resource.json

@@ -52,6 +52,8 @@
         "delete_question": "You are about to delete an object resource!",
         "delete_no": "No, it was an accident (go back)",
         "delete_yes": "Yes, take it away",
-        "preview": "Preview"
+        "preview": "Preview",
+        "3d_object": "3D Object",
+        "upload_3d_object": "Upload 3D object"
     }
 }

backend/en/resource_incha.json

@@ -64,6 +64,9 @@
         "pdf_added": "Added a new link to a PDF file",
         "video_added": "Added a new link to a video file",
         "audio_added": "Added a new link to an audio file",
-        "edited": "Resource information has been updated"
+        "edited": "Resource information has been updated",
+        "upload_3d_title": "Upload a 3D representation of the object",
+        "prerequisites_format_obj_zip": "The uploaded file must be a .zip archive containing an .obj file of the same name with possible additional .mtl files.",
+        "select_3d_obj": "Please select an 3D object file (.obj) for upload"
     }
 }