Update runtime files

runtime/spell/sr/convert.vim

@@ -0,0 +1,30 @@
+:e sr.aff
+:normal gg
+:normal wgu$
+:3d
+:4d
+:normal G
+:normal o
+:r sr-Latn.aff
+:%s#^\(SFX\|PFX\).*[а-џa-ž]\zs$# .#g
+:normal G
+?SET
+:.,+5d
+:.,$s#^\(SFX\|PFX\) \zs\(\d\+\)#\= eval(submatch(2) .. ' + 1903')#
+:w ../sr.aff
+:bd!
+:e sr.dic
+:%s#a#а#g
+:%s#e#е#g
+:normal G
+:normal o
+:r sr-Latn.dic
+:normal 201dd
+:.,$s#/\zs\(\d\+\)\(,\(\d\+\)\)\?$#\=(submatch(2) == '') ? eval(submatch(1) + '1903') : eval(submatch(1) + '1903') .. ',' .. eval(submatch(3) + '1903')#
+:normal {
+:normal dd
+:normal gg
+:normal C502898
+:w ../sr.dic
+:bd!
+:q!