Ensure network name in confirm page container is defined

[danjm]

Fixes #14446

The network name being used in the message translation was undefined on non-default infura networks. This PR corrects that by pulling a name for the network from state, if our defaults are unavailable.

Before:

After:

In additon to the before/after screenshot, this PR makes the following error go away: Error: Insufficient number of substitutions for key "insufficientCurrency" with locale "en"

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [bad81ba]

• builds: chrome, firefox, opera
• builds (beta): chrome, firefox, opera
• builds (flask): chrome, firefox, opera
• build viz: Build System
• code coverage: Report
• storybook: Storybook
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • phishing-detect: phishing-detect
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1260 ± 35 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	79	148	97	19	9
		domContentLoaded	1187	1435	1244	65	31
		load	1187	1435	1260	73	35
		domInteractive	1187	1435	1244	65	31

highlights:

storybook

• ui/pages/confirm-approve/confirm-approve.stories.js
• ui/pages/confirm-deploy-contract/confirm-deploy-contract.stories.js
• ui/pages/confirm-send-ether/confirm-send-ether.stories.js
• ui/pages/confirm-send-token/confirm-send-token.stories.js
• ui/pages/confirm-token-transaction-base/confirm-token-transaction-base.stories.js
• ui/pages/confirm-transaction-base/confirm-transaction-base.stories.js