Merge different languages for language stats (#24900)

Fix #24896

If users set different languages by `linguist-language`, the `stats` map
could be: `java: 100, Java: 200`.

Language stats are stored as case-insensitive in database and there is a
unique key.

So, the different language names should be merged to one unique name:
`Java: 300`

modules/log/logger_global.go

@@ -10,7 +10,7 @@ import (
 
 // FallbackErrorf is the last chance to show an error if the logger has internal errors
 func FallbackErrorf(format string, args ...any) {
-	_, _ = fmt.Fprintf(os.Stderr, format+"\n", args)
+	_, _ = fmt.Fprintf(os.Stderr, format+"\n", args...)
 }
 
 func GetLevel() Level {