Add error for failured to send reaction.

public/locales/en-GB/app.json

@@ -4,11 +4,14 @@
   },
   "action": {
     "close": "Close",
+    "close_search": "Close search",
     "copy_link": "Copy link",
     "edit": "Edit",
     "go": "Go",
     "invite": "Invite",
     "no": "No",
+    "open_search": "Open search",
+    "pick_reaction": "Pick reaction",
     "raise_hand_or_send_reaction": "Raise hand or send reaction",
     "register": "Register",
     "remove": "Remove",
@@ -58,6 +61,7 @@
     "preferences": "Preferences",
     "profile": "Profile",
     "raise_hand": "Raise hand",
+    "search": "Search",
     "settings": "Settings",
     "unencrypted": "Not encrypted",
     "username": "Username",
@@ -128,6 +132,7 @@
   "rageshake_sending": "Sending…",
   "rageshake_sending_logs": "Sending debug logs…",
   "rageshake_sent": "Thanks!",
+  "reaction_search": "Search reactions…",
   "recaptcha_caption": "This site is protected by ReCAPTCHA and the Google <2>Privacy Policy</2> and <6>Terms of Service</6> apply.<9></9>By clicking \"Register\", you agree to our <12>End User Licensing Agreement (EULA)</12>",
   "recaptcha_dismissed": "Recaptcha dismissed",
   "recaptcha_not_loaded": "Recaptcha not loaded",