[ML] Changes UI info text for model test and model deployment

[szabosteve]

Summary

This PR amends the info text of the:

• language identification test flyout,
• model deployment modal.

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[davidkyle]

LGTM

[peteharverson]

LGTM

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 25997d2

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
ml	3.4MB	3.4MB	+38.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	411	415	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	15	17	+2
securitySolution	490	494	+4
total			+6

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream