Fix up some localizations

config/locales/en.yml

@@ -1,9 +1,9 @@
 ---
 en:
   about:
-    about_instance: "<em>%{instance}</em> is a Mastodon instance."
     about_mastodon: Mastodon is a <em>free, open-source</em> social network. A <em>decentralized</em> alternative to commercial platforms, it avoids the risks of a single company monopolizing your communication. Pick a server that you trust &mdash; whichever you choose, you can interact with everyone else. Anyone can run their own Mastodon instance and participate in the <em>social network</em> seamlessly.
     about_this: About this instance
+    apps: Apps
     business_email: 'Business e-mail:'
     contact: Contact
     description_headline: What is %{domain}?
@@ -20,7 +20,6 @@ en:
       public: Public timelines
     features_headline: What sets Mastodon apart
     get_started: Get started
-    learn_more: Learn more
     links: Links
     other_instances: Other instances
     source_code: Source code