Question: When did Swedish become the official language of the country where the Embassy of France is in the same city as Leksaksmuseet?

full_context: Document 1: Museum of the Moscow Railway (Paveletskaya station): The museum was formerly the Museum of Lenin’s funeral train. It still houses exhibits relating to Vladimir Lenin's Funeral train including the 4-6-0 steam locomotive U-127 (Russian У-127) and Lenin’s funeral van No 1691. The collection of exhibits has been expanded and it now also houses many artifacts concerning the Moscow Railway and the history of Russian Railways from the beginnings of the railways in Russia to the present day. The collection includes models, displays, documents, photographs, uniforms and items of railway equipment. U-127 is the only surviving Russian locomotive class U.
Document 2: Toy Museum Stockholm: Leksaksmuseet is a toy museum located (since 2005) in Spårvägsmuseet in Södermalm, Stockholm. It was originally located at Mariatorget, where it first opened on August 30, 1980. One notable attraction is the railway modelling collection of the Railway Society (Järnvägssällskapet). The focus is on "the 20th century, with emphasis on technical toys".
Document 3: Saab Car Museum: The Saab Car Museum is an automobile museum in Trollhättan, Sweden. It covers the history of the Saab brand of automobiles manufactured by Saab under various owners since 1947.
Document 4: Electric Railways Museum of Piraeus: The Electric Railways Museum of Piraeus () is a railway museum in Piraeus, Greece. The museum was established in 2005 in the space of the former Post Office in Piraeus railway station. The museum displays a collection of small size items, photographs and documents related to the history of Athens-Piraeus Railway, Hellenic Electric Railways (EIS), Piraeus-Perama light railway, Piraeus Harbour tramway, Electric Transport Company (IEM) and Athens-Piraeus Electric Railways (ISAP). The museum also owns a collection of approximately 2000 small and medium size items and 3000 books, leaflets and other documents, currently in storage.
Document 5: Embassy of Sweden, Prague: The Swedish Embassy to the Czech Republic is located on Úvoz street, in Hradčany, the castle region of Prague. It is close to the Strahov Monastery. The embassy has a great view of the rest of Prague because it is located up on the hill. A pedestrian path, named after Swedish diplomat Raoul Wallenberg, who saved thousands of Jews from the Holocaust, leads from embassy up to the Petrin Hill.
Document 6: Embassy of France, Prague: The Embassy of France to the Czech Republic is located on Velkopřevorské náměstí, in Malá Strana, Prague, next to Vltava's island Kampa. It occupies the large baroque Buquoy Palace (1719). The ground floor of the Embassy was flooded during the August 2002 floods.
Document 7: Embassy of France, Stockholm: The Embassy of France in Stockholm is the diplomatic mission of the French Republic in Sweden. The chancery is located at Kommendörsgatan 13.
Document 8: 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 9: Languages of Sweden: Swedish evolved from Old Norse around the 14th and 15th century, and historically, the Swedish dialects were generally much more different than today. Since the 20th century Standard Swedish prevails throughout the country. The Scandinavian languages constitute a dialectal continuum and some of the traditional Swedish dialects could equally be described as Danish (Scanian) or Norwegian (Jamtlandic).
Document 10: Embassy of Sweden, Rome: The Embassy of Sweden in Rome is Sweden's diplomatic mission in Italy. The current building was built between 1965-1966 and completed in 1967.
Document 11: Old English: Old English is a West Germanic language, developing out of Ingvaeonic (also known as North Sea Germanic) dialects from the 5th century. It came to be spoken over most of the territory of the Anglo-Saxon kingdoms which became the Kingdom of England. This included most of present-day England, as well as part of what is now southeastern Scotland, which for several centuries belonged to the Anglo-Saxon kingdom of Northumbria. Other parts of the island – Wales and most of Scotland – continued to use Celtic languages, except in the areas of Scandinavian settlements where Old Norse was spoken. Celtic speech also remained established in certain parts of England: Medieval Cornish was spoken all over Cornwall and in adjacent parts of Devon, while Cumbric survived perhaps to the 12th century in parts of Cumbria, and Welsh may have been spoken on the English side of the Anglo-Welsh border. Norse was also widely spoken in the parts of England which fell under Danish law.
Document 12: Dutch language: Old Dutch naturally evolved into Middle Dutch. The year 1150 is often cited as the time of the discontinuity, but it actually marks a time of profuse Dutch writing and during this period a rich Medieval Dutch literature developed. There was at that time no overarching standard language; Middle Dutch is rather a collective name for a number of closely related dialects whose ancestor was Old Dutch. But they were all mutually intelligible. In fact, since Dutch is a rather conservative language, the various literary works of that time today are often very readable for modern-day speakers.
Document 13: Embassy of France, London: The Embassy of France in London is the diplomatic mission of France to the United Kingdom. Located just off Knightsbridge at Albert Gate, one of the entrances to Hyde Park, it is situated immediately opposite the Embassy of Kuwait.
Document 14: Latvian Railway History Museum: The Latvian Railway History Museum is a railway museum in Riga, Latvia. It was established on August 30, 1994 and contains more than a thousand items, documents and photographs related to railway communications and signalling equipment, tools and instruments, uniforms and badges.
Document 15: Old English: Old English developed from a set of Anglo-Frisian or North Sea Germanic dialects originally spoken by Germanic tribes traditionally known as the Angles, Saxons, and Jutes. As the Anglo-Saxons became dominant in England, their language replaced the languages of Roman Britain: Common Brittonic, a Celtic language, and Latin, brought to Britain by Roman invasion. Old English had four main dialects, associated with particular Anglo-Saxon kingdoms: Mercian, Northumbrian, Kentish and West Saxon. It was West Saxon that formed the basis for the literary standard of the later Old English period, although the dominant forms of Middle and Modern English would develop mainly from Mercian. The speech of eastern and northern parts of England was subject to strong Old Norse influence due to Scandinavian rule and settlement beginning in the 9th century.
ground_truth: 20th century
sub_queries: Leksaksmuseet >> location Answer: Stockholm
Embassy of France, Stockholm >> country Answer: Sweden
when did swedish become the official language of Sweden Answer: 20th century