Part 2: Copy text button at most textarea fields is now translatable.

Thanks to xet7 !

client/components/main/editor.jade

@@ -1,5 +1,5 @@
 template(name="editor")
-  a.fa.fa-copy(title="copy text to clipboard")
+  a.fa.fa-copy(title="{{_ 'copy-text-to-clipboard'}}")
   span.copied-tooltip {{_ 'copied'}}
   textarea.editor(
     dir="auto"