First: thanks for LO, great work.
On a fresh install of LO 6.2.0 on MacOS 10.13.6, I clicked on a Help icon, which opened a browser at URL file:///Applications/LibreOffice.app/Contents/Resources/help/index.html
However the displayed page was blank. Browser console revealed an error in languages.js: "Unexpected token: var"
Discovered languages.js in above dir was not valid JS; it had "-n" at the start of each line and no commas between the language ID strings.
The installed languages.js looked like this:
-n var languagesSet = new Set([
It clearly was intended to look like this:
var languagesSet = new Set([
A quick edit to the second style fixed this and docs in browser worked fine thereafter.
*** This bug has been marked as a duplicate of bug 121532 ***