Many books by Abigail Reynolds are available in translation. Here is a partial list of them:

French:

La Force de Mr Darcy (By Force of Instinct)
Seule avec Mr Darcy (Alone with Mr. Darcy)
Les Darcy du Derbyshire (The Darcys of Derbyshire)
Avec ou sans Mr Darcy? (What Would Mr. Darcy Do?)
La conquête de Mr Darcy (To Conquer Mr. Darcy)
Elizabeth Darcy (Mr. Fitzwilliam Darcy: The Last Man in the World)

German:

Der Preis des Stolzes (The Price of Pride)
Eine Frage der Ehre (A Matter of Honor)
Mr. Darcys Zauber (Mr. Darcy’s Enchantment)
Die Darcy Brüder (The Darcy Brothers – mit Monica Fairview, Maria Grace, Cassandra Grafton, and Susan Mason-Milks)
Mr. Darcys Loyalität (Conceit & Concealment)
Mr. Darcys Reise (Mr. Darcy’s Journey)
Mr. Darcys feine Verwandtschaft (Mr. Darcy’s Noble Connections)
Allein mit Mr. Darcy (Alone with Mr. Darcy)
Die Darcys von Derbyshire (The Darcys of Derbyshire)
Die Kraft des Instinkts (By Force of Instinct)
Es regnet seine Lauf (A Succession of Rain, a free short story)

Greek:

Μόνο με τον Κύριο Ντάρσι (Alone with Mr. Darcy)

Italian:

Il Viaggio di Mr. Darcy (Mr. Darcy’s Journey)
I Parenti Nobili di Mr. Darcy (Mr. Darcy’s Noble Connections)
I Darcy del Derbyshire (The Darcys of Derbyshire)
Il Rifugio di Mr. Darcy (Mr. Darcy’s Refuge)
Sola con Mr. Darcy (Alone with Mr. Darcy)

Portuguese:

O Preço do Orgulho (The Price of Pride)
O Refúgio do Sr. Darcy (Mr. Darcy’s Refuge)
Os Darcys de Derbyshire (The Darcys of Derbyshire)
Sozinha Com Mr. Darcy  (Alone with Mr. Darcy)
Os Parentes Nobres de Mr. Darcy (Mr. Darcy’s Noble Connections)

Spanish:

Un Asunto de Honor (A Matter of Honor)
El Encantamiento del Sr. Darcy (Mr. Darcy’s Enchantment)
Presunción y Ocultamiento (Conceit & Concealment)
La Carta Del Sr. Darcy (Mr. Darcy’s Letter)
Interludio con el Sr. Darcy (Intermezzo – a short story)
Los Ilustres Vínculos del Sr. Darcy (Mr. Darcy’s Noble Connections)
El Refugio De Darcy (Mr. Darcy’s Refuge)
A Solas con el Sr. Darcy (Alone with Mr. Darcy)
Por la Fuerza del Instinto (By Force of Instinct)
Los Darcy de Derbyshire (The Darcys of Derbyshire)
El Viaje del Sr. Darcy (Mr. Darcy’s Journey)
Presunción y Ocultamiento (Conceit & Concealment)