Question: What is the least popular official language of the country the performer of Je vais me marier, Marie belongs to?

full_context: Document 1: Je vais me marier, Marie: "Je vais me marier, Marie" (English translation: "I´m getting married, Mary") was the Swiss entry in the Eurovision Song Contest 1973, performed in French by Patrick Juvet.
Document 2: Switzerland: Aside from the official forms of their respective languages, the four linguistic regions of Switzerland also have their local dialectal forms. The role played by dialects in each linguistic region varies dramatically: in the German-speaking regions, Swiss German dialects have become ever more prevalent since the second half of the 20th century, especially in the media, such as radio and television, and are used as an everyday language, while the Swiss variety of Standard German is almost always used instead of dialect for written communication (c.f. diglossic usage of a language). Conversely, in the French-speaking regions the local dialects have almost disappeared (only 6.3% of the population of Valais, 3.9% of Fribourg, and 3.1% of Jura still spoke dialects at the end of the 20th century), while in the Italian-speaking regions dialects are mostly limited to family settings and casual conversation.
Document 3: Patrick Moutal: Patrick Moutal is a French sitarist and musicologist. He has been teaching north Indian classical music at the Paris Conservatoire (CNSMDP) since 1984 (Jazz & Improvised Musics and Pedagogy dpts).
Document 4: Switzerland: Switzerland has four official languages: principally German (63.5% total population share, with foreign residents, in 2013); French (22.5%) in the west; and Italian (8.1%) in the south. The fourth official language, Romansh (0.5%), is a Romance language spoken locally in the southeastern trilingual canton of Graubünden, and is designated by Article 4 of the Federal Constitution as a national language along with German, French, and Italian, and in Article 70 as an official language if the authorities communicate with persons who speak Romansh. However, federal laws and other official acts do not need to be decreed in Romansh.
Document 5: List of territorial entities where German is an official language: Country Population 2014 / 2015 Speakers Notes (native) (second) Germany 81,083,600 74,430,000 (91.8%) 5,600,000 (6.9%) Sole nationwide official language Belgium 11,245,629 73,000 (0.6%) 2,472,746 (22%) De jure nationwide co-official language (majority language only in German speaking community) Austria 8,602,112 7,999,964 (93%) 516,000 (6%) De jure sole nationwide official language Switzerland 8,256,000 5,329,393 (64.6%) 395,000 (5%) Co-official language at federal level; de jure sole official language in 17, co-official in 4 cantons (out of 26) Luxembourg 562,958 11,000 (2%) 380,000 (67.5%) De jure nationwide co-official language Liechtenstein 37,370 32,075 (85.8%) 5,200 (13.9%) De jure sole nationwide official language Total 109,787,669 87,875,432 9,368,946 Total speakers: 97,244,378
Document 6: Patrice et Mario: Patrice et Mario were an Italian singer-guitarist duo popular in France the 1940-1950s. Patrice (Patrizzio Paganessi, 1915-26 April 1992) and Mario (Mario Moro, 1918 - 9 August 2002) were part of the vogue for Mediterranean music in France exemplified by Luis Mariano and Tino Rossi. Their popularity in Africa led to their name being used by another duo, consisting of Philippe Vungbo (alias Lando) and Cantador Rossignol.
Document 7: Dialect: The situation in Switzerland and Liechtenstein is different from the rest of the German-speaking countries. The Swiss German dialects are the default everyday language in virtually every situation, whereas standard German is seldom spoken. Some Swiss German speakers perceive standard German to be a foreign language.
Document 8: I Love America (Patrick Juvet song): "I Love America" is 1978 disco hit by Swiss-born performer Patrick Juvet. Along with the tracks, "Where Is My Woman" and "Got A Feeling", it peaked at number five on the disco chart in the United States. It was included in the compilation album, "A Night at Studio 54", in 1979.
Document 9: Patrick Sébastien: Patrick Boutot (born 14 November 1953 in Brive-la-Gaillarde, Corrèze), better known as Patrick Sébastien, is a French television host, producer and media personality, radio host, singer, writer, producer, director, impressionist entertainer, comedian, TV and film actor, and former president of the French rugby team CA Brive.
Document 10: Un banc, un arbre, une rue: "Un banc, un arbre, une rue" ("A Bench, a Tree, a Street") was the winning song of the Eurovision Song Contest 1971 performed in French by French singer Séverine, representing Monaco.
Document 11: Henri Christiné: The son of a French Savoyard watchmaker, Christiné was born in Geneva, Switzerland. He began by teaching at the lycée in Geneva, while pursuing his interest in music and playing organ in a local church. He married a cafe singer whose troupe was passing through Geneva, and went with her to Nice where they were married. He made his home in France, writing songs firstly for his wife and then for popular singers such as Mayol, Dranem, and Fragson. He also conducted for the music hall at the Place Clichy.
Document 12: Le Chant de Mallory: "Le chant de Mallory" (English translation: "Mallory's Song") was the French entry in the Eurovision Song Contest 1964, performed in French by Rachel. The song was written by André Popp and Pierre Cour, the team behind France's winning entry in the 1960 Contest, "Tom Pillibi".
Document 13: Je suis l'enfant soleil: "Je suis l'enfant soleil" (translated: "I Am the Sun Child" or "I'm A Child of the Sun") was the French entry in the Eurovision Song Contest 1979, performed in French by Anne-Marie David. David had won Eurovision six years earlier, representing Luxembourg at the 1973 Contest with "Tu te reconnaîtras".
Document 14: Switzerland: Three of Europe's major languages are official in Switzerland. Swiss culture is characterised by diversity, which is reflected in a wide range of traditional customs. A region may be in some ways strongly culturally connected to the neighbouring country that shares its language, the country itself being rooted in western European culture. The linguistically isolated Romansh culture in Graubünden in eastern Switzerland constitutes an exception, it survives only in the upper valleys of the Rhine and the Inn and strives to maintain its rare linguistic tradition.
Document 15: Patrick Juvet: Patrick Juvet (born 21 August 1950, in Montreux, Switzerland) is a former model turned singer-songwriter, who had a string of hit records in France. While his early career was focused on making pop records, he found international success as a disco music performer in the latter half of the 1970s.
ground_truth: Romansh
sub_queries: Je vais me marier, Marie >> performer Answer: Patrick Juvet
Which country does Patrick Juvet belong to? Answer: Switzerland
What is the least popular official language of Switzerland ? Answer: Romansh