I'm not sure how you'd go about approximating the percentage of products with English, but I can suggest an easy workaround: the camera mode of Google Translate, formerly known as Word Lens.
This is available for Android and Apple mobile phones, costs nothing and works offline as well if you download the language pack in advance.
(Obligatory disclaimer: I ...
I don't think such a list exists as such.
Also this will be very specific to the area / country you are travelling to.
My impression is that there are certain everyday items that you want to have during your travels that make you feel more confortable.
Make a list of these items:
Item name (Brand)
alternative brands that are similar in nature