tec: Allow to limit the number of links in feeds

[marienfressinaud]

Pull request checklist:

• [x] code is manually tested
• [x] interface works on both mobiles and big screens N/A
• [x] accessibility has been tested N/A
• [x] tests are updated
• [x] French locale is synchronized N/A
• [x] documentation is updated (including comments, commit messages, migration notes, …)

If you think one of the item isn’t applicable to the PR, please check it anyway and precise N/A next to it.