Thanks for your suggestion. The plugin just added the support for two columns reading for original and translation content. You can find this new feature in latest version v2.3.1.
Quote:
Originally Posted by Nam Bui
This plugin is really useful, and I appreciate the developers for creating it. However, when using it, I face some difficulties in quickly distinguishing between the original text and the translated text on e-ink devices based on color (especially on devices with only two colors, black and white). It would be great to have a border between the original text and the translated text (like a rectangular frame around the translated text). Alternatively, splitting the book page into two sides (left for the original text and right for the translated text) with a dividing line would be helpful. Another suggestion is to provide a quick way to switch between the original and translated text. Once again, thanks to the developers of this plugin, and have a great day, everyone! 
An example of a bilingual book has a border in the middle separating the original paragraph from the translated paragraph:
An example of borders is that if we use the method of surrounding translated paragraphs with rectangles, we can customize the borders of those shapes to look beautiful and easily distinguishable from the original paragraph. Translated paragraphs will be added to one of those rectangles depending on your preference:
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