Implement templates validation

Registered by Sergey Lukjanov

It is possible to create an indubitable wrong templates atm and so we should discuss how to solve this problem.

Based on / Details in comments of: https://bugs.launchpad.net/savanna/+bug/1218445

Blueprint information

Status:
Not started
Approver:
Sergey Lukjanov
Priority:
Undefined
Drafter:
None
Direction:
Approved
Assignee:
None
Definition:
Discussion
Series goal:
None
Implementation:
Not started
Milestone target:
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