Change redact -> remove to improve clarity

Addresses #2814

Non-technical users may not understand what 'redact' means and can more easily understand what 'Remove' does. See discussion on vector-im/riot-web#2814 for more information.

Signed-off-by: Travis Ralston <travpc@gmail.com>

src/components/views/context_menus/MessageContextMenu.js

@@ -129,7 +129,7 @@ module.exports = React.createClass({
         if (!eventStatus && !this.props.mxEvent.isRedacted()) { // sent and not redacted
             redactButton = (
                 <div className="mx_MessageContextMenu_field" onClick={this.onRedactClick}>
-                    Redact
+                    Remove
                 </div>
             );
         }