Make <li> inside articles constrained to 100% width.

Display bug observed on http://1flow.io/fr/lire/530afd8784cc1709ba4044f3/ where a <code> element creates an horizontal scrollbar at the page level, which is awful. With this patch, the <p> inside the <li> is correctly displayed without needing to scroll. Only the <code> element is awful, wich is better than the whole page.
version bump for hotfix.
Merge branch 'hotfix/0.26.1.2'