Translation manual is in the attachement to this message. Following applies:

I've included only pandoc to dokuwiki (raw or "aliased") and pandoc to none. Stripped away the "none to dokuwiki".
Source for the pandoc languages : --list-highlight-languages (version 1.19.2.1)
Source for the dokuwiki languages : dokuwiki syntax page (latest stable)
Source for file suffix to language mapping for Geshi : geshi github

Note: when dokuwiki hits new stable, additional languages should be included:

[haxe] -> [haxe]
[julia] -> [julia]
[kotlin] -> [kotlin]
[mathematica] -> [mathematica]
[metafont] -> [metapost]
[octave] -> [octave]
[postscript] -> [postscript]
[r] -> [rsplus]
[rust] -> [rust]

I did not mapped versions, so for example php maps to php, not php5 for dokuwiki.

And I did not tried to be extra smart about the compilers, eg. fasm / nasm don't map to asm

in my list. If you think that they should, feel free to modify my list :).