Browsing Slovenian translation

TRANSLATORS: This refers to background image mode (stretched or
in left-top corner). Note that GRUB will accept only original
keywords stretch and normal, not the translated ones.
So please put both in translation
e.g. stretch(=%STRETCH%)|normal(=%NORMAL%).
The percents mark the translated version. Since many people
may not know the word stretch or normal I recommend
putting the translation either here or in "Background image mode."
string.