added spanish translation

app/assets/javascripts/components/locales/es.jsx

+const en = {
+  "column_back_button.label": "Back",
+  "lightbox.close": "Close",
+  "loading_indicator.label": "Loading...",
+  "status.mention": "Mention",
+  "status.delete": "Delete",
+  "status.reply": "Reply",
+  "status.reblog": "Reblog",
+  "status.favourite": "Favourite",
+  "status.reblogged_by": "{name} reblogged",
+  "video_player.toggle_sound": "Toggle sound",
+  "account.mention": "Mention",
+  "account.edit_profile": "Edit profile",
+  "account.unblock": "Unblock",
+  "account.unfollow": "Unfollow",
+  "account.block": "Block",
+  "account.follow": "Follow",
+  "account.block": "Block",
+  "account.posts": "Posts",
+  "account.follows": "Follows",
+  "account.followers": "Followers",
+  "account.follows_you": "Follows you",
+  "getting_started.heading": "Getting started",
+  "getting_started.about_addressing": "You can follow people if you know their username and the domain they are on by entering an e-mail-esque address into the form at the top of the sidebar.",
+  "getting_started.about_shortcuts": "If the target user is on the same domain as you, just the username will work. The same rule applies to mentioning people in statuses.",
+  "getting_started.about_developer": "The developer of this project can be followed as Gargron@mastodon.social",
+  "column.home": "Home",
+  "column.mentions": "Mentions",
+  "column.public": "Public",
+  "tabs_bar.compose": "Compose",
+  "tabs_bar.home": "Home",
+  "tabs_bar.mentions": "Mentions",
+  "tabs_bar.public": "Public",
+  "compose_form.placeholder": "What is on your mind?",
+  "compose_form.publish": "Publish",
+  "navigation_bar.settings": "Settings",
+  "navigation_bar.public_timeline": "Public timeline",
+  "navigation_bar.logout": "Logout",
+  "reply_indicator.cancel": "Cancel",
+  "search.placeholder": "Search",
+  "search.account": "Account",
+  "search.hashtag": "Hashtag",
+  "suggestions_box.who_to_follow": "Who to follow",
+  "suggestions_box.refresh": "Refresh",
+  "upload_button.label": "Add media",
+  "upload_form.undo": "Undo"
+};
+
+export default en;