Add Ballerina to the list of languages (#2684)

Author: zuiderkwast

languages.json

@@ -1,6 +1,7 @@
 {
     "ActionScript": "actionscript",
     "ActiveX/COM+": "activex-com",
+    "Ballerina": "ballerina",
     "Bash": "bash",
     "Boomi": "boomi",
     "C": "c",
@@ -61,4 +62,4 @@
     "VCL": "vcl",
     "Xojo": "xojo",
     "Zig": "zig"
-}
+}