-| in DB (for example in `videos` table), and value are human-friendly names
-| for categories. IDs must be numeric and must preferably start from 1.
+| in DB (for example in `videos` table), and values are string identifiers
+| for categories. Category names localization can be made by concatenating
+| 'ui_categ_' with the value in order to obtain a language key.
+| IDs must be numeric and must preferably start from 1.