How can I set the gadget so that it will default as English to Spanish or Spanish to English which is what I use most? Every time I reopen the page, it defaults to English to German and I have to change it every single time.
In Firefox I go to Preferences under Menu/Add ons/Extensions and there are default From/To languages. Set these to auto/en or auto/es. I don't think you can give it a default target when translating from your default language.
I had the problem that it decided that my default target language was Spanish which I rarely read and don't understand. This did solve that problem.
Manually add 'Spanish to English' cookie to Chrome & bookmark it.
Search Google Translate > Set languages to Spanish to English > Copy the URL > Go to Chrome settings > Search Cookies > Site settings > Cookies and site data > Click Add next to Allow > Paste the URL
Then add a bookmark to the translated page.