* Update i18n-helper to allow substitutions of react components and wrapping of translation substrings
* Simplify code in i18n-helper.js related to substitutions, including react substitutions.
* Remove wrapper support from i18n in favour of using translations in substitutions.
* Fix i18n-helper substitution logic: ensure correct index of substitution is applied
* Throw error if there are not enough substitutions for a translation phrase
* Adds unit tests for now i18n-helper substitution functionality
* Fix grammar, react element line spacing and test layout+readability in i18n-helper.test.js
* Use @metamask/eslint-config@1.1.0
* Use eslint-plugin-mocha@6.2.2
* Mark root ESLint config as root
* Update Mocha ESLint rules with shared ESLint config
* Various component tests and some conditional statements
Conditional in account-menu in removeAccount when keyring sometimes is not initially provideed
Conditional on unlock-page when there is no target.getBoundingClientRect on the element.
* Update helpers
* Remove component debugging
* Add default params for render helpers
* Remove stubComponent for old Mascot
Changes in https://github.com/MetaMask/metamask-extension/pull/7893 has prevented the need to stub it out.
Change logout to lock in account-menu test
* eslint: Check for unused function arguments
* eslint: Ignore unused '_' in argument list
Also allow any number of '_' e.g., '__' or '___' which is to be used sparingly
* Remove and rename unused arguments
