Should this be ‘the website’ (i.e. the website I talked to you about earlier etc.) or ‘a website’ (i.e. a/one website I [gladly] recommend)?

Hmmmmm .... I don't know whether this would apply to this context ... Well, imagine a guy who's talking in a TV advertising: "Aquafresh is the toothpaste I recommend to my patients, blablabla ..." --- I don't think he would say "... is A toothpaste" ^^ Here, I think that the use of "the" implies the fact that "Tatoeba" is already famous or excellent in some field. You see?

I see. Thanks for the explanation. That has made it clear.

By the way, what does the Tamazight word for ‘website’ literally mean?

Thank you for askings this question:

The word "adeg" comes from Tuareg word "édeg" which means "place, location". It comes from a Panamazigh (probably Proto-Amazigh) root, DG/DƔ which refers to "place". The noun survived in Tuareg, however, it doesn't exist (as a noun) in the Northered dialects (Kabyle, Shawi, Riffan, etc.).

In the Northern Amazigh dialects, the preposition "deg" [= meaning "in"] survived - however, in most dialects, it is either pronounced "di" [with the loss of weak [g]] and "g" (with the loss of weaker [d]):

Deg wasif === In the river

G wasif === In the river (as it is pronounced in many dialects)

Apparently, there were two variants during the Proto-Amazigh period, "*adeɣ" and "adeg", both meaning place. The form with "DG" survived in Tuareg noun "édeg" [place] and "deg" (in) in the Northern dialects. The form "*adeɣ" survived in Tuareg preposition "daɣ" [in = deg] and in Tashelhit (Moroccan) preposition "ɣ" (which also means "in"): Ɣ tmazirt (in the country).

Our association (cultural group) suggested the word "adeg". Others, especially in Morocco, suggested the word "asmel" for website. I think that "asmel" comes from the verb "mel" which means "to show" (since a website is used to show, present something, some company, etc.). "s" is the prefix used in Amazigh to derive instrument/tool names: "agem" (to bring water from the well/spring" --- "Asagem" (pitcher) (the object, thing, you use in order to bring water). "Asmel" (the thing you use in order to show/present something).

I'm not quite sure if "Tatoeba" is already famous. ☺
In my perception "website" is defined nevertheless by the dependent clause "I recommend to other translators, colleagues and language students". But I think "a website" would be correct as well, especially in the case, we presume you recommended more the one site.