Allow users to select Sinhala

(cherry picked from commit 5f6a8d74c11c4b158ac7198da890db7da7b2ff18)
Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

src/libvlc-module.c

@@ -84,6 +84,7 @@ static const char *const ppsz_language[] =
     "ro",
     "ru",
     "zh_CN",
+    "si",
     "sr",
     "sk",
     "sl",
@@ -136,6 +137,7 @@ static const char *const ppsz_language_text[] =
     "Română",
     "Русский",
     "简体中文",
+    "සිංහල",
     "српски",
     "Slovensky",
     "slovenščina",