fix: refactor appStrings imports

lib/config/definitions.ts

lib/platform/azure/index.ts

lib/platform/bitbucket/index.ts

lib/platform/github/index.ts

lib/platform/gitlab/index.ts

lib/platform/utils/pr-body.ts

lib/workers/branch/index.ts

lib/workers/branch/parent.ts

lib/workers/branch/status-checks.ts

lib/workers/global/index.ts

lib/workers/pr/body/config-description.js

lib/workers/pr/body/controls.js

lib/workers/pr/body/notes.js

lib/workers/repository/error-config.js

lib/workers/repository/finalise/index.js

lib/workers/repository/finalise/validate.js

lib/workers/repository/init/config.js

lib/workers/repository/master-issue.js

lib/workers/repository/onboarding/branch/check.ts

lib/workers/repository/onboarding/branch/config.ts