can you mention any person who worked with this latter version?
Josef Dobrovský
Czech language
During the national revival, in 1809 linguist and historian Josef Dobrovský released a German-language grammar of Old Czech entitled "Ausführliches Lehrgebäude der böhmischen Sprache" ("Comprehensive Doctrine of the Bohemian Language"). 
what is the main language in czech republic Czech how is it classified? Czech is distinguished from other West Slavic languages by a more-restricted distinction between "hard" and "soft" consonants does it have older and more recent versions? Yes,  "Old Czech" and "Modern Czech" please explain the former. The term "Old Czech" is applied to the period predating the 16th century, with the earliest records of the high medieval period. The Bohemian (Czech) language is first recorded in writing in glosses and short notes during the 12th to 13th centuries. Literary works written in Czech appear in the late 13th and early 14th century and administrative documents first appear towards the late 14th century. The first complete Bible translation also dates to this period. Old Czech texts, including poetry and cookbooks, were produced outside the university as well and the latter version? The modern standard Czech language originates in standardization efforts of the 18th century. By then the language had developed a literary tradition, and since then it has changed little; journals from that period have no substantial differences from modern standard Czech, and contemporary Czechs can understand them with little difficulty.
wiki:1611698
Czech language [SEP] Modern Czech
Czech philologists studied sixteenth-century texts, advocating the return of the language to high culture. This period is known as the Czech National Revival (or Renaissance). During the national revival, in 1809 linguist and historian Josef Dobrovský released a German-language grammar of Old Czech entitled "Ausführliches Lehrgebäude der böhmischen Sprache" ("Comprehensive Doctrine of the Bohemian Language"). Dobrovský had intended his book to be descriptive, and did not think Czech had a realistic chance of returning as a major language. However, Josef Jungmann and other revivalists used Dobrovský's book to advocate for a Czech linguistic revival. Changes during this time included spelling reform (notably, "í" in place of the former "j" and "j" in place of "g"), the use of "t" (rather than "ti") to end infinitive verbs and the non-capitalization of nouns (which had been a late borrowing from German).