If you use the botanical name to do the search you can use Google Translate (or another translator) to read the information about each plant in your own language.
Our All Things Plants database relies mainly on the currently accepted botanical name as listed in The Catalogue of Life. You can click on different languages but I don't yetsee the Bulgarian language as an option:
http://www.catalogueoflife.org...
The list of available languages is updated from time to time; hopefully Bulgarian will be added soon.
http://www.catalogueoflife.org...
Hope this helps.