"Line" manager instead of "Account" manager

[Jerome-Herbinet]

Just check the commit. This has been discussed in the design team public talk room (confirmed by @ChristophWurst). I'll make sure it's OK in the "Contacts" app (organization chart).

• Resolves: #

Summary

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[susnux]

/backport to stable30

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