Add Sinhala for v7.4

Web/css/help.less

@@ -5180,6 +5180,10 @@ a.text-container-link-changelog {
         background-position: -96px -176px;
     }
 
+    &.language_si-LK:before {
+        background-position: -192px -112px;
+    }
+
     &.language_sk-SK:before {
         background-position: -16px -192px;
     }

Web/js/help/language_table.js

@@ -50,6 +50,7 @@
 "pt-PT",     "pt",           1,1,1,0,0,0,0,
 "ro-RO",     "ro",           0,0,1,23,0,0,0,
 "ru-RU",     "ru",           1,1,1,21,1,1,1,
+"si-LK",     "si",           0,0,1,21,0,0,0,
 "sk-SK",     "sk",           1,1,1,21,0,0,0,
 "sl-SI",     "sl",           1,1,1,23,0,0,0,
 "sq-AL",     "sq",           0,0,0,0,0,0,0,

Web/js/lng/lng.de.js

@@ -48,7 +48,8 @@
 "pt-BR","Portugiesisch - brasilianische Variante",
 "pt","Portugiesisch",
 "ro","Rumänisch",
-"ru","Russisch",
+"ru", "Russisch",
+"si", "Singhalesisch",
 "sk","Slowakisch",
 "sl","Slovenisch",
 "sq","Albanisch",

Web/js/lng/lng.es.js

@@ -48,7 +48,8 @@
 "pt-BR","Portugués - Brasil",
 "pt","Portugués",
 "ro","Rumano",
-"ru","Ruso",
+"ru", "Ruso",
+"si", "Cingalés",
 "sk","Eslovaco",
 "sl","Esloveno",
 "sq","Albanés",

Web/js/lng/lng.fr.js

@@ -48,7 +48,8 @@
 "pt-BR","Portugais - brésilien",
 "pt","Portugais",
 "ro","Roumain",
-"ru","Russe",
+"ru", "Russe",
+"si", "Cinghalais",
 "sk","Slovaque",
 "sl","Slovène",
 "sq","Albanais",

Web/js/lng/lng.it.js

@@ -48,7 +48,8 @@
 "pt-BR","Portoghese - Brasiliano",
 "pt","Portoghese",
 "ro","Rumeno",
-"ru","Russo",
+"ru", "Russo",
+"si", "Singalese",
 "sk","Slovacco",
 "sl","Sloveno",
 "sq","Albanese",

Web/js/lng/lng.js

@@ -48,7 +48,8 @@
 "pt-BR","Portuguese - Brazilian",
 "pt","Portuguese",
 "ro","Romanian",
-"ru","Russian",
+"ru", "Russian",
+"si", "Sinhala",
 "sk","Slovak",
 "sl","Slovenian",
 "sq","Albanian",

Web/js/lng/lng.ru.js

@@ -48,7 +48,8 @@
 "pt-BR","Португальский - Бразильский",
 "pt","Португальский",
 "ro","Румынский",
-"ru","Русский",
+"ru", "Русский",
+"si", "Сингальский",
 "sk","Словацкий",
 "sl","Словенский",
 "sq","Албанский",