Change wording of 'read more/less' & add to locale

locales/en-US.json

@@ -156,6 +156,8 @@
     "Title": "Title",
     "Playlist privacy": "Playlist privacy",
     "Editing playlist `x`": "Editing playlist `x`",
+    "Show more": "Show more",
+    "Show less": "Show less",
     "Watch on YouTube": "Watch on YouTube",
     "Hide annotations": "Hide annotations",
     "Show annotations": "Show annotations",

src/invidious/views/watch.ecr

@@ -31,11 +31,11 @@ we're going to need to do it here in order to allow for translations.
  -->
 <style>
 #readmorebutton + label > a::after {
-    content: "<%= translate(locale, "Read more") %>"
+    content: "<%= translate(locale, "Show more") %>"
 }
 
 #readmorebutton:checked + label > a::after {
-    content: "<%= translate(locale, "Read less") %>"
+    content: "<%= translate(locale, "Show less") %>"
 }
 </style>
 <% end %>