Use language codes instead of full names

source/tests/the_raven/1845-poe.md

@@ -1,7 +1,7 @@
 Author: Edgar Allan Poe  
 Title: The Raven  
 Year: 1845  
-Language: English  
+Language: en  
 Code: poe  
 
 ## 1

source/tests/the_raven/1881-vrchlicky.md

@@ -1,7 +1,7 @@
 Author: Jaroslav Vrchlický  
 Title: Havran  
 Year: 1881  
-Language: Czech  
+Language: cs  
 Code: vrch  
 
 ## 1

source/tests/the_raven/1885-muzik.md

@@ -1,7 +1,7 @@
 Author: Augustin Eugen Mužík  
 Title: Havran  
 Year: 1885  
-Language: Czech  
+Language: cs  
 Code: muz  
 
 ## 1

source/tests/the_raven/1900-zenon-przesmycki.md

@@ -1,7 +1,7 @@
 Author: Zenon Przesmycki  
 Title: Kruk  
 Year: 1900  
-Language: Polish  
+Language: pl  
 Code: zen  
 
 ## 1

source/tests/the_raven/1910-barbara-beaupre.md

@@ -1,7 +1,7 @@
 Author: Barbara Beaupré  
 Title: Kruk  
 Year: 1910  
-Language: Polish  
+Language: pl  
 Code: beau  
 
 ## 1

source/tests/the_raven/1918-dostal-lutinov.md

@@ -1,7 +1,7 @@
 Author: Karel Dostál-Lutinov  
 Title: Havran  
 Year: 1918  
-Language: Czech  
+Language: cs  
 Code: dolu  
 
 ## 1

source/tests/the_raven/1970-baranczak.md

@@ -1,7 +1,7 @@
 Author: Stanisław Barańczak  
 Title: Kruk  
 Year: 1970  
-Language: Polish  
+Language: pl  
 Code: bar  
 
 ## 1

source/tests/the_raven/config.json

@@ -10,6 +10,6 @@
 		"1970-baranczak.md"
 	],
 	"display": {
-		"Language": [ "Czech" ]
+		"Language": [ "cs" ]
 	}
 }