Menubar is not displayed

[janojan]

Describe the bug
Menu bar is not displayed. On the left hand side I can only the time elapsed since the last modification of file but nothing more. Screenshot attached.

To Reproduce
Steps to reproduce the behavior:

1. Install text app.
2. Open any text file.

Expected behavior
Menu bar with different formatting options should be seen.

Screenshots

Client details:

• OS: Windows 10
• Browser: Chrome, Firefox
• Version: 77.0.3865.90, 69.0.1
• Device: Desktop

Text app version: (see Nextcloud apps page)
1.0.2

Operating system:
Ubuntu 18.04.3

Web server:
Apache 2.4.49

Database:
Mariadb 10.1.41

PHP version:
7.2.19

Nextcloud version: (see Nextcloud admin page)
16.0.5

Nextcloud log (data/nextcloud.log)

Nothing being displayed while opening app.

Browser log

Insert your browser log here, this could for example include:
![owncloud-network-log](https://user-images.githubusercontent.com/28716996/66061469-d4f46e80-e53f-11e9-81eb-6d39c860f27c.PNG)

![owncloud-console-log](https://user-images.githubusercontent.com/28716996/66061570-03724980-e540-11e9-92ad-eb476c2c3a0f.PNG)

HTML code of the div element of menubar:

<div data-v-7e2d47d8="" data-v-2d1b43bf="" class="menubar"><!----> <div data-v-2d1b43bf="" id="editor-session-list"><div data-v-2d1b43bf="" class="save-status has-tooltip" data-original-title="null">
						8 months ago
					</div> <div data-v-3938a18e="" data-v-2d1b43bf="" class="session-list"><div data-v-3938a18e="" class="avatar-list"><!----> </div> <div data-v-3938a18e="" class="popovermenu menu-right" style="display: none;"><ul data-v-2f982451="" data-v-3938a18e=""></ul> </div></div></div></div>

[janojan]

It looks like the menubar works only with *.md files and not *.txt files.