Some renames

Summary:
Some non-semantic changes. Mostly an earlier rename that was accidentally done only locally rather than across the codebase

Also support `.spec` test extension, which is more idiomatic Jest, since we don't use the `.node` and `.electron` distinction anymore anyway.

Reviewed By: jknoxville

Differential Revision: D22976438

fbshipit-source-id: f3abedb36cbac1e835295177117ccbca492a67a1

desktop/jest.config.js

@@ -22,6 +22,6 @@ module.exports = {
   },
   clearMocks: true,
   coverageReporters: ['json-summary', 'lcov', 'html'],
-  testMatch: ['**/**.node.(js|jsx|ts|tsx)'],
+  testMatch: ['**/**.(node|spec).(js|jsx|ts|tsx)'],
   testEnvironment: 'jest-environment-jsdom-sixteen',
 };