Part of the answer is in the comment I wrote here:
http://tatoeba.org/eng/sentences/show/126

And in my todo list for the weekend: write some guideline so that users know how contribute correctly.

this have already been discussed ^^

soon, we will add an unlink feature, so you will be able to say "these sentence are no longer translations to each other"

so what to do in your case

in fact you're not supposed to change the B sentence, as long as the sentence is by itself correct, because as you've said, it will make translation of B erroneous too

so you just add a B2 sentence and add a note that the B sentence will need to be unlink to A sentence

Like sysko said, we are actually open source. The reason why it's not promoted anywhere is because:

1) The code hasn't met my standards of elegance yet... Still too many parts that make me cringe when I look at them.

2) We still don't have a sound methodoly and organization in our way of working and I really don't have time to manage more people ^^'

(we're in PHP though, sorry :P)

In fact the code is already available on a svn public repository (with read only access and a AGPL licence (I'm a bit FOSS fanatic), but I don't think we're against code contributors, so write access can be granted for motivated code-contributors)

after why it's not explicity written somewhere on the website, hmm I think (Trang has maybe much relevant reason than me) it's because the project lacks documentation and is in a rewriting / cleaning phase, so we prefer to show a pretty reviewed code ^^

but if you want to take a look, I can give you the repo in private message

Maybe that's a bit too complicated. At least there are several other feature requests in the pipe, that might have more impact.
As you indicated in the 2nd note already though, adding a "news feed" for requests on one's sentences is surely needed.

I would propose to change your request into something with a broadend scope: "disown request" to disown sb by taking over their sentence. This could also be used on inactive users. Some time without reaction *zing* you go ahead.

Normally he fcbond should have received a notfication when you commented his sentence, but the notification system was broken :'( ...about 100 notifications that should have been sent but weren't, *sigh*.

Anyway, having a link to a page that lists the comments posted on your sentences is something I should have done a long time ago... When I decided to integrate an "ownership/adoption" system in replacement of the moderation system we used to have, it was obvious that users should be able to quickly access comments on their sentences.

But I think that having a checkbox would be add unnecessary complexity. People will usually read all the comments on their sentences, so there's no need to filter out specifically those that require a correction.

+1 for the wiki, in fact it's already in the todo list (in fact as for the code, we've also a ticket system for developper)

and you're true it can be great as someone has already talked about tagging
http://tatoeba.org/fre/wall/index#message_200

:p

What about books that are out of copyright?

Is there a specific case where you would need this information?

One not too difficult way is to look at the creation date of each sentence (which you can see in the first entry in the logs). If A was created before B, then it must have been A->B.

Yep we used to have a discussion about that, and we don't plan to only add languages which have an ISO 639 alpha 3 code, wikipedia as to do this because they have tons of contributors, and an encyclopedia need much more data than just a database of example sentences, so I can understand why they don't prefer to have a lot of articles rather than a lot of dialects or so

but for us, I think as soon as the language is enough different to be not totaly intelligible with an other, then we can add it as a specific language (that's the case for shanghainese for example, the closest ISO 639 code is for Wu language, but the Wu language, for which shanghainese is a "dialect", is divided in some other "dialects" (even i don't really like the word "dialect"), which are not intelligible with shanghainese)

and as I think tatoeba can be used to keep a trace of language, especially endangered ones, I would find really pityfull to not add a small language, only because it has no iso 639-3 code (moreover I've heard iso 639-4 code will be released)

for the moment (but we will change it soon) you have no way to directly specify the language
But, if Tatoeba misdetects the language, then you simply click on the flag next to the incriminate sentence and set it to the right one. It can be done whenever you want, as soon as the sentence belong to you (like editing)