Fix tests, more replacing with mergedConfig

src/App.js

src/components/attachment/attachment.js

src/components/emoji_input/emoji_input.js

src/components/gallery/gallery.js

...terface_language_switcher/interface_language_switcher.vue

src/components/mobile_nav/mobile_nav.js

...ts/mobile_post_status_button/mobile_post_status_button.js

src/components/notification/notification.js

src/components/post_status_form/post_status_form.js

src/components/settings/settings.js

src/components/still-image/still-image.js

src/components/style_switcher/style_switcher.js

src/components/timeline/timeline.js

src/components/user_card/user_card.js

src/components/video_attachment/video_attachment.js

...es/notifications_fetcher/notifications_fetcher.service.js

src/services/timeline_fetcher/timeline_fetcher.service.js

test/unit/specs/components/emoji_input.spec.js

test/unit/specs/components/user_profile.spec.js