Webpage Translation Language Options
The Language options allow to set up different parameters and settings of the webpage translation for Opera for a specific website language.
To access Language settings, open a website (domain), and perform the translation using context menu, shortcuts keys Alt+P , or the toolbar button 
if you customized the toolbar button in Advanced Options. Then, click Options on the toolbar, and open the Language tab.
If you need to update language options, follow the same steps to access Languages Options.
Translate from - customize parameters and settings for translation behavior for a specific language.
If you want to set up the same parameters for all languages, choose "All" from the "Translate from" language list.
When you first open the Language tab, the original language of the website will be displayed.
Translate from "All" - the same translation parameters and settings will be applied to any language selected from the drop-down box.
Always - perform an automatic translation for the specific language selected from the drop-down box.
The parameter "Always" in combination with Translate from "All" perform an automatic translation of any website.
Toolbar - display the translation toolbar on the top of the translated webpage.
If you want to hide the translation toolbar for this specific website language, clear the checkbox.
The toolbar will be replaced with the 
"Show" toolbar icon in the right upper corner, which will open the translation toolbar upon clicking on it.
Show original on mouseover - display the original text when hovering your mouse over the translation.
IF A TRANSLATED WEBSITE DOESN'T HAVE ANY CUSTOM SETTINGS, THEN LANGUAGE SETTINGS OVERWRITE GENERAL WEBPAGE TRANSLATION SETTINGS.
Reset settings
If you need to completely reset your language settings, go to Webpage Translation Options and click Reset on Language settings. This will erase all custom Language settings.
Please note that the Language settings won't interfere with custom Domains settings. The Domains settings will stay intact.