I believe that you blog is being visited by people from different countries, most time they want to read your posts but can not do this because can not understand the language you are writing on. So it could be nice if you add Google Translate Gadget in your blog. This is really easy to do, and bellow you can read everything step by step.
1. go to the page Google Translate
2. Choose your site language
3. You will be given a HTML code under line "Copy and paste the HTML below to include the gadget on your webpage." copy it.
4. On your blog go to "Customize"
6. There will be opened a window and you have to paste your copied HTML code there (from the 3 the one you saved).
That's all! Like this 4-5-6 you can add all the html codes.