Rename pages in left menu and titles

In left menu:

• "User" to "Users"
• "Roles" to "Users roles"

In page titles:

• "User" to "Users managment"
• "Roles" to "Users roles managment"
• "Groups" to "Groups managment"
• "Users" to "Requests managment" (Requests page)
• "Policies" to "Policies managment"

In page tabs:

• "User list" to "Users list" (Users page)

added Frontend label

changed title from Rename tab "Role" to "User role" in left menu to Rename pages in left menu and titles

changed the description

created branch 21-rename-pages-in-left-menu-and-titles to address this issue

mentioned in merge request !10 (merged)

marked the checklist item "User" to "Users" as completed

marked the checklist item "Roles" to "Users roles" as completed

marked the checklist item "User" to "Users managment" as completed

marked the checklist item "Users" to "Requests managment" (Requests page) as completed

marked the checklist item "Policies" to "Policies managment" as completed

marked the checklist item "Groups" to "Groups managment" as completed

marked the checklist item "Roles" to "Users roles managment" as completed

marked the checklist item "User list" to "Users list" (Users page) as completed

assigned to @remi.bisson

mentioned in merge request !11 (merged)

mentioned in commit f0fa217a

closed with merge request !11 (merged)