Localization fixes

Description

Case 1

Original report: https://community-release.mattermost.com/core/pl/jjdsdsu98prt9xncyhkhpgawno

There is an inconsistency between "Permissions Schemes" "System Scheme" + singular and plural forms, creating lack of consistency.

We invariably use:

  • `permissions schemes`, `permission scheme`, and `permission schemes`.

  • `system scheme` and `system schemes`.

To qualify as the same feature, a check needs to be performed each time one of these statements is used.

Case 2

Original report: https://community-release.mattermost.com/core/pl/ry3s3i1iijnuib8s6zuph469ae

Observed: In `.channel_header.groupMessageHasGuests This group message has guests` doesn't need to specify `message`.
Expected: `This group has guests in it` should be enough (and is more coherent).

Case 3

Original report: https://community-release.mattermost.com/core/pl/hsdrpuxiaby5tc3dor6o63qqoy

Observed: `.invitation_modal.confirm.sent-header Successful Invites`.
Expected: The above needs a rewording like `Invites successfully sent`.

QA Test Steps

None

Status

Mana

None

Assignee

Unassigned

QA Assignee

None

Reporter

Amy Blais

Epic Link

None

Fix versions

Mattermost Team

Platform

Sprint

None

Labels

None

QA Testing Areas

None

GitHub Issue

None
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