Update glossary terms to current new TB funcionality.
Reported by translator @zakooch while translating the glossary, some terms are outdated in relation to the Tor Browser:
== Security Slider
Tor Browser includes a “Security Slider” that lets you increase your security by disabling certain web features that can be used to attack your security and anonymity. It is located in Torbutton’s “Privacy and Security Settings” menu. Increasing the level (Low, Medium-Low, Medium-High, High) of the Security Slider will disable or partially disable certain web browser features to protect against possible attacks.
== Torbutton
A button marked by a little green onion to the left of the URL bar. Its menu offers you "New Identity", "New Tor Circuit for this Site", "Privacy and Security Settings...", "Tor Network Settings..." and "Check for Tor Browser Update..." options.
walled garden ref: https://www.transifex.com/otf/tor-project-support-community-portal/translate/#es/support-portal/163144603