Question: During which time period did Bern, Switzerland make French language fashionable?
About the article "Switzerland", section "Literature".

Candidate passages:
As there is no dominant national language, the four main languages of French, Italian, German and Romansch form the four branches which make up a literature of Switzerland.
The original Swiss Confederation, from its foundation in 1291 up to 1798, gained only a few French-speaking districts in what is now the Canton of Fribourg, and so the German language dominated.
During that period the Swiss vernacular literature was in German, although in the 18th century, French became fashionable in Bern and elsewhere.
At that time, Geneva and Lausanne were not yet Swiss: Geneva was an ally and Vaud a subject land.
The French branch does not really begin to qualify as Swiss writing until after 1815, when the French-speaking regions gained full status as Swiss cantons.
The Italian and Romansch-Ladin branches are less prominent.
Like the earlier charters of liberties, the original League of 1291 was drawn up in Latin.
Later alliances among the cantons, as well as documents concerning the whole Confederation — the Parsons Ordinance of 1370, the Sempach Ordinance of 1393, the Compact of Stans (1481) and all the Recesses of the Diets — were compiled in German.
Political documents are not necessarily literature, but these pre-Reformation alliances rested on popular consent, and were expressed in vernacular German rather than in clerkly Latin. 
Subdivisions of the canton of Bern include districts since 2010, which are called "arrondissements administratifs" in French. 
In East Hampton Sara Wiborg and Gerald Murphy met when they were both adolescents.
Gerald was five years younger than Sara, and for many years they were more familiar companions than romantically attached; they became engaged in 1915, when Sara was 32 years old.
Sara's parents did not approve of their daughter marrying someone "in trade," and Gerald's parents were not much happier with the prospect, seemingly because his father found it difficult to approve anything that Gerald did.
After marrying they lived at 50 West 11th Street in New York City, where they had three children.
In 1921 they moved to Paris to escape the strictures of New York and their families' mutual dissatisfaction with their marriage.
In Paris Gerald took up painting, and they began to make the acquaintances for which they became famous.
Eventually they moved to the French Riviera, where they became the center of a large circle of artists and writers of later fame, especially Zelda and F. Scott Fitzgerald, Ernest Hemingway, John Dos Passos, Fernand Léger, Jean Cocteau, Pablo Picasso, Archibald MacLeish, John O'Hara, Cole Porter, Dorothy Parker and Robert Benchley.
Prior to their arrival on the French Riviera, the region was experiencing a period when the fashionable only wintered there, abandoning the region during the high summer months.
However, the activities of the Murphys fueled the same renaissance in arts and letters as did the excitement of Paris, especially among the cafés of Montparnasse.
In 1923 the Murphys convinced the Hotel du Cap to stay open for the summer so that they might entertain their friends, sparking a new era for the French Riviera as a summer haven.
The Murphys eventually purchased a villa in Cap d'Antibes and named it "Villa America"; they resided there for many years.
When the Murphys arrived on the Riviera, lying on the beach merely to enjoy the sun was not a common activity.
Occasionally, someone would go swimming, but the joys of being at the beach just for sun were still unknown at the time.
The Murphys, with their long forays and picnics at La Garoupe, introduced sunbathing on the beach as a fashionable activity.
They had three children, Baoth, Patrick, and Honoria.
In 1929, Patrick was diagnosed with tuberculosis.
They took him to Switzerland, and then returned to the U.S. in 1934, where Gerald stayed in Manhattan to run Mark Cross, serving as president of the company from 1934 to 1956; he never painted again.
Sara settled in Saranac Lake, New York to nurse Patrick, and Baoth and Honoria were put in boarding schools.
In 1935, Baoth died unexpectedly of meningitis as a complication of measles, and Patrick succumbed to TB in 1937.
Archibald MacLeish based the main characters in his play "J.B." on Gerald and Sara Murphy.
Later they lived at "The Dunes", once the largest house in East Hampton.
By 1941, the house proved impossible to rent, sell or even maintain; the Murphys had it demolished, and they themselves moved to the renovated dairy barn. 
Bern has several dozen cinemas.
As is customary in Switzerland, films are generally shown in their original language (e.g., English) with German and French subtitles.
Only a small number of screenings are dubbed in German. 
Bern (or Berne) is the capital of Switzerland.
Canton of Bern, of which Bern is the capital Bern (district), an administrative district in the Canton of Bern University of Bern Bern or Berne may also refer to: