[FIX] website_blog: cut teaser after 150 chars

Space as word separator does not work in some non-latin languages like Japanese.
Cut arbitrarily after 150 chars

Closes #23219

addons/website_blog/models/website_blog.py

@@ -165,7 +165,7 @@ class BlogPost(models.Model):
                 blog_post.teaser = blog_post.teaser_manual
             else:
                 content = html2plaintext(blog_post.content).replace('\n', ' ')
-                blog_post.teaser = ' '.join(filter(None, content.split(' '))[:50]) + '...'
+                blog_post.teaser = content[:150] + '...'
 
     @api.multi
     def _set_teaser(self):