Exporting a template's talents gives a TBC url for Wowhead. This functionality should be updated to provide an appropriate
www.wowhead.com/classic/ link instead.

Url engineering example:
https://www.wowhead.com/classic/talent-calc/mage/230005021--05253203102351051/2ccBFdHdjPqdddNssstss0bbbAF2ME0jhh

/230005021--05253203102351051/ - Refers to ranks of selected talents and their respective tab.
230005021 - Tab 1
-- means there's nothing in Tab 2
05253203102351051 - Tab 3
Tab 1 - First talent has 2 ranks put in it total, 2nd talent has 3... 3rd, 4th, and 5th have 0, 6th has 5.... etc.

2ccBFdHdjPqdddNssstss0bbbAF2ME0jhh - Order in which talents are selected.
0, 1, and 2 refer to the tab index (1, 2, 3rd tabs respectively).
"abcdefghjkmnpqrstvw" values refer to the selected talent in a given tree, ordered by row and tier.
A capital value means the talent is maxed as part of its selection. In the above example, the 2nd talent chosen is the 2nd available talent in the third tree and has a max rank of 3 and is selected 3 times in a row.

Hope this helps, thanks! :)