Development Hell: The game was announced in 1997. It was released in America on May 29, 1999 and in PAL territories on July 23, 1999.
Executive Meddling: In this interview, developer and producer Eric Caen blames Warner and DC for many of the game's more head scratching moments, like the virtual world setting (as they refused to let Superman hurt "real" people) and the reliance on power-ups to use Superman's abilities. Also, "politics" were apparently responsible for the game's delays, and the delays were responsible for the forced release of this unfinished product. A PlayStation version was also in the pipeline, but the developers' license expired before it could be released.
Reprogrammation happens to be the French word for Reprogram. Given that the scenario, the fact that Titus is a French company and the fact that this game is essentially an Obvious Beta due to Executive Meddling mentioned above, it's possible that they overlooked it.
Also, Aventures is the French word for Adventures. Again, possibly overlooked because Titus is a French company. The problem here is that it's used in an English title.
A PlayStation version of the game was also planned. In fact, the developers for the PlayStation version were actually going to fix the N64 version's problems, but the license expired before they finished it, and they never got around to releasing it. (Eric Caen claims the game was 75% complete before the higher-ups pulled the plug.)
They originally considered using Bizarro, who actually had a model and some voice clips, but was removed from the final product.