Add Rumantsch Grischun to Print dialog control

[chicoff]

I, @Viglino, if you like, we have translated the print dialog control into Romansh (rm).

title: 'Stampar',
orientation: 'Orientaziun',
portrait: 'Vertical',
landscape: 'Horizontal',
size: 'Format',
custom: 'Grondezza dal monitur',
margin: 'Margin',
scale: 'Stgala',
legend: 'Legenda',
north: 'Fritga nord',
mapTitle: 'Titel',
saveas: 'Memorisar sco...',
saveLegend: 'Memorisar legenda...',
copied: '\u2714 Copià en las notizias',
errorMsg: 'Betg memorisar la carta',
printBt: 'Stampar',
clipboardFormat: 'Copia en las notizias...',
jpegFormat: 'Memorisar sco jpeg',
pngFormat: 'Memorisar sco png',
pdfFormat: 'Memorisar sco pdf',
none: 'betg',
small: 'pitschen',
large: 'grond',
cancel: 'Stizzar'

[Viglino]

Should work now: https://viglino.github.io/ol-ext/examples/canvas/map.control.printdialog.fr.html?lang=rm

[chicoff]

Perfect! Thank you