Clean up grammar and typos in translation variables

Description

Fix provided by R87A on GitHub: https://github.com/igniterealtime/Spark/pull/524

Fixes grammar and typos in translation string variables themselves.

Environment

None
Fixed

Assignee

Arthur Ostretsov

Reporter

wroot

Labels

Expected Effort

None

Ignite Forum URL

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Components

Fix versions

Affects versions

Priority

Minor
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