[EPIC] All standard Back Office extension usecases

PrestaShop is a CMS and its richness comes from how developers use it as a foundation to build e-commerce applications. To do so, PrestaShop provides many extension capabilities: modules, themes, hooks, template overrides, raw class overrides, services decoration ...

This issue aims to gather all the standard extension usecases so we can verify that, for each of them

• a suitable solution is available (if not: we can plan to implement something)
• a documentation and/or an example is available

Examples

Add fields inside BO forms

As a Module Developer
As my customer (the shop administrator) wants PrestaShop workflow to ackowledge
some extra properties on products / customers / ...
I want to be able to add new fields inside any forms of the Back Office
and choose where in the BO page they are displayed
and when shop administrator hits the "save" button, receive the submitted data
so I can validate it (= verify it, and if not valid refuse the form submission and display an error message)
and store it

Add BO pages reachable through the navigation menu

As a Module Developer
As my customer (the shop administrator) wants to add PrestaShop BO pages
I want to be able to add links inside the navigation menu in the Back Office

Remove BO pages reachable through the navigation menu

As a Module Developer
As my customer (the shop administrator) wants to remove PrestaShop BO pages
because they are useless for him
I want to be able to remove/hide links inside the navigation menu in the Back Office

Customize navigation menu wording

As a Module Developer
As my customer (the shop administrator) wants to improve the wording of the navigation menu
I want to be able to customize the wordings used for the navigation menu, depending on the language

Start by reviewing the listed Back Office extension use cases, including adding fields, navigation links, and menu wording. Done means cataloging the standard use cases and identifying a suitable solution plus documentation or an example for each.