Merge pull request #3145 from chrisgarrity/issue/2070-localize-default

src/containers/costume-tab.jsx

src/containers/stage-selector.jsx

src/containers/target-pane.jsx

src/lib/default-project/index.js

src/lib/default-project/project-data.js

src/lib/default-project/project.json

src/lib/empty-assets.js

src/lib/file-uploader.js

src/lib/project-loader-hoc.jsx

src/lib/shared-messages.js

src/lib/storage.js

test/unit/util/project-loader-hoc.test.jsx