Remove localisation of errors from server

Description

Errors should not be localised unless they surface in the UI. We should only localise errors that are percolated up beyond the API layer.

QA Test Steps

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Mana

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Assignee

Unassigned

QA Assignee

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Reporter

George Goldberg

Epic Link

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Fix versions

Mattermost Team

Platform

Sprint

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QA Testing Areas

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GitHub Issue

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