When rendering error page, the default header_title is computed in global_definitions and this is done by concatenating string:ERP5 (which is unicode) and the title of the portal (which is an UTF-8 encoded string), which causes an UnicodeDecodeError, because the portal title was decoded as ASCII. Because header_title is usually an UTF-8 encoded string, also use an UTF-8 encoded string for 'ERP5' default value.
Using the needs keyword makes jobs run before their stage is reached. Jobs run as soon as their needs relationships are met, which speeds up your pipelines.
If you add needs to jobs in your pipeline you'll be able to view the needs relationships between jobs in this tab as a Directed Acyclic Graph (DAG).