You're right, Oliver. That site is more or less the equivalent of Moodle's AMOS translation system. I have occasionally used it and found it rather user-friendly.
There are, however, 2 main points on which AMOS is superior:
- for each language used in Moodle there is a translation "supervisor" who is responsible for checking the validity of the translations submitted by volunteer translators, especially checking the consistency of the terms used;
- when the submitted translations have been validated, the language pack is immediately updated and made available to Moodle users. Unfortunately this is not the case with H5P where one has to wait (sometimes for a very long time) for a new version of the H5P content to be released along-with the new translations.
- for each language used in Moodle there is a translation "supervisor" who is responsible for checking the validity of the translations submitted by volunteer translators, especially checking the consistency of the terms used;
- when the submitted translations have been validated, the language pack is immediately updated and made available to Moodle users. Unfortunately this is not the case with H5P where one has to wait (sometimes for a very long time) for a new version of the H5P content to be released along-with the new translations.