There have been complaints of people whose mother tongue is, for example, English, but is living in a foreign country, eg. Japan. When they log into their Blogger Dashboard, it is all in that foreign language and they have problems understanding it. For such cases, it is easy to change the language even if you are living in a foreign country. Sign into Dashboard, then at the top right hand corner of the Dashboard is this:

Right at the bottom is a section "Language" with a drop-down menu. Click the down arrow and a long lists of available languages will be shown. Selectg your preferred language and your preferred language will automatically be saved.
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There is also another setting you can do. In the Dashboard, for the relevant blog, click SETTINGS, then click the FORMATTING sub-tab. Somewhere in the middle of the page will be a drop-down menu to set the language for the blog:

Click the down arrow and select your preferred language. Then at the bottom of the page, click "Save settings".
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If that still didn't get the effect you want, you may have to change the language option of your browser.
For FireFox, in the menu bar at the top of the browser, click TOOLS > OPTIONS and in the pop up, click the "Advanced" tab

. Then in the "Languages" section, click "Chose":

In the second section which is a drop-down menu for "Select a language to add...", click the down arrow and select your preferred language. Once you select the language, the "Add" button will become active. Click that. The rest, I have never tried because I have no need to change the preferred language of my browser, and you are on your own from there.
BTW, if you are like the majority of surfers who only have Internet Explorer, you should seriously consider getting the FireFox browser. I would highly recommend it, and if you go to
FireFox with Google toolbar, you will see a screenshot of a section of a page from Blogger Help where Blogger recommend Firefox.