Operation errors must be translatable

Registered by Gustavo Narea

Operands and operators raise a InvalidOperationError exception when an invalid operation is requested.

However, such messages are always in English, although they must be translatable because they're user-visible.

We should implement a FormEncode-like translation effort for such exceptions.

Blueprint information

Status:
Not started
Approver:
Gustavo Narea
Priority:
High
Drafter:
Gustavo Narea
Direction:
Approved
Assignee:
Gustavo Narea
Definition:
Approved
Series goal:
Accepted for trunk
Implementation:
Not started
Milestone target:
milestone icon 1.0a2

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