css - Language choice affects text overflow in html(bootstrap) (Django) -

i'm using bootstrap implement post detail page.

it works , fit tho format when using korean.

but, if wrote english contents, overflow format.

what's wrong it?
here code :

models.py

from django.db import models django.core.urlresolvers import reverse django.conf import settings   def upload_location(instance, file_name):     return "{}/{}".format(instance.author.username, file_name)   class post(models.model):     author = models.foreignkey(settings.auth_user_model, on_delete=models.cascade)     title = models.charfield(max_length=100)     content = models.textfield()     image = models.imagefield(upload_to=upload_location, blank=true, null=true)      created_at = models.datetimefield(auto_now_add=true)     updated_at = models.datetimefield(auto_now=true)      class meta:         ordering = ('-created_at',)      def __str__(self):         return self.title      def get_absolute_url(self):         return reverse(             "posts:detail",             kwargs={                 "pk": self.id,             }         )      def get_image_url(self):         if self.image:             return self.image.url         return "http://placehold.it/300x200" 

post_detail.html

{% extends 'chacha_dabang/skeleton/base.html' %} {% load pipeline %}  {% block content %}     <div class="container">         <section class="post-content-section">             <h2> {{ post.title }} </h2>             <h5 style="text-align: right;"> {{ post.created_at }} </h5>             <hr class="thin">             <img src="{{ post.get_image_url }}" alt="image">             <p> {{ post.content }} </p>         </section>          </br>         <hr class="thin">         </br>          <section id="comment-section" data-post-id={{ post.pk }}>             <h3> 댓 글 (<span id="comment-count"></span>)</h3>             <ul>             </ul>             <form method="post" action="">                 {% csrf_token %}                 {{ form.as_p }}                 <button type="submit" class="save btn btn-default">save</button>             </form>         </section>     </div> {% endblock %}  {% block custom_js %}     {% javascript "comments" %}     {% javascript "message" %} {% endblock %}