Fix for displaying quote based messages in conversation

In conversation, messages with single quote (') or double quote(") quote
wasn't rendered correct. It was difficult for journalist to read those
messages. This commit is fixing that problem of parsing quote based
messages and improves readability of the text in the conversation.

Resolves: #175

securedrop_client/gui/widgets.py

@@ -388,7 +388,7 @@ def __init__(self, text):
         super().__init__()
         layout = QVBoxLayout()
         self.setLayout(layout)
-        message = QLabel(html.escape(text))
+        message = QLabel(html.escape(text, quote=False))
         message.setWordWrap(True)
         layout.addWidget(message)