Document SimpleFieldSet
Preliminary untested support for key==<base64 encoded value>
Add tests and factor out writeValue(), which isn't quite as straightforward now.
MergeSFS: default write changes; add --sdout, help

Writing changes to the source file avoids the potentially awkward
MergeSFS source override > temp; cp temp source.
Change constant name, docs for consistency.

It is now a darknet connection limit, not just a connection limit.
Merge remote branch 'operhiem1/comments' into next
Merge remote branch 'operhiem1/mergesfs' into next
Remove too many peers warning, now obsolete.
Add Enzo's Index to default bookmarks.

Add it before Linkageddon because the categories are useful in avoiding
things one does not wish to see, and remove AFKIndex because it is no
longer being updated.
Update default bookmark editions.
Add missing Enzo's Index short description.
Make the entropy warning much clearer.
Add CSS id based on l10n key to menu items.

Having ids for menu headers but not items is inconsistent and limits
what CSS can reasonably do.
Fix l10n re max peers
Refactor: Centralise l10n code for Option's.
Allow ${default} in config option descriptions.
Use ${default} for maxPeers config description.
Fix the error message as well.
Merge remote branch 'operhiem1/More-ThemeCSS' into next
Fix bogus End truncating japanese translation, thanks mhatta for finding this.