Naidheachdan

Bug fixes and improvements:

• missing_letter, data fix for bolsa and pastel in Spanish by Edy Paz
• lang, fix a bug in case of excactly 12 triplets in the dataset by Jan Boon
• trying to avoid a crash case in the menu by Bruno Coudoin
• gletters, add Norwegian Bokmål dataset based on the Nynorsk one by Bruno Coudoin
• Fix a typo in submarine.c by Gabor Kelemen

Translations update:

• Updated Russian translation by Stas Solovey
• Updated Spanish translation by Daniel Mustieles
• Updated Serbian translation by Мирослав Николић
• Updated Brazilian Portuguese translation by Rafael Ferreira
• Updated Hungarian translation by Balázs Úr
• Updated Czech translation by Marek Černocký
• Updated Hungarian translation by Balázs Úr