made reading unicode explicit for markdown articles

This reverts commit 5412feb615.

main.py

@@ -107,11 +107,11 @@ def page(f):
             r = f(*args, **kwargs)
         except ExposedException as e:
             app.logger.error(f"Caught error:")
-            app.logger.error(str(e))
+            app.log_exception(e)
             return flask.render_template('error.jinja', error=e, **env)
         except Exception as e:
             app.logger.error(f"Caught unplanned error:")
-            app.logger.error(str(e))
+            app.log_exception(e)
             return flask.render_template('error.jinja', error=ExposedException('Something went wrong. :('), **env)
 
         if isinstance(r, werkzeug.wrappers.Response):
@@ -125,7 +125,7 @@ def page(f):
             rendered = flask.render_template(template_candidates, **env)
         except Exception as e:
             app.logger.error(f"Caught templating error.")
-            app.logger.error(str(e))
+            app.log_exception(e)
             return flask.render_template('error.jinja', error=ExposedException('Something went wrong because of a broken template. :('), **env)
 
         return rendered
@@ -235,7 +235,7 @@ def article_load(name):
     article_path = os.path.join(app.config['ARTICLE_DIR'], name + '.md')
     if os.path.exists(article_path):
 
-        with open(article_path, 'r') as fd:
+        with open(article_path, 'r', encoding='UTF-8') as fd:
             text = fd.read()
 
         text = markdown_compiler.convert(text)