i_mdi_dictionary escape sequence corrupts rest of the file
#### 🗹 Requirements

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#### 🎯 Subject of the issue

the Material Design dictionary icon uses an escaped backslash which seems to mess up the renderings of all subsequent characters.

This is the mdi_dictionary character using 'cat -A'.
i='M-oM-,M-^\\'

The \\' likely causing issues. This issue can be seen simply using the test-fonts.sh script. Or in the lib/i_material.sh script. Is there a way to workaround this issue?

Thank you.

#### 🔧 Your Setup

- _Which font are you using (e.g. `Anonymice Powerline Nerd Font Complete.ttf`)?_Hack Nerd Font Complete.ttf
- _Which terminal emulator are you using (e.g. `iterm2`, `urxvt`, `gnome`, `konsole`)?_gnome and others
- _Are you using OS X, Linux or Windows? And which specific version or distribution?_Linux CentOS 8

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