Fix some issues with make dist-gzip
First, the calling sequence for `build_and_dump_html_index` has
changed and we didn't update `common-lang.mk` to use the new
convention.
Second, `build-html-index.lisp` didn't support the "ja" language
because it didn't have a hash-table entry for "ja" to get the name of
the file containing the function and variable index. This has been
fixed. AFAICT, the index file uses the English name.
This doesn't fix everything with `make dist-gzip`, though. It still
fails. I think the Russian docs don't build. That's a different
issue.