Now install Python packages to virtual environments.

.gitignore

@@ -19,3 +19,6 @@ game/webrtc/
 
 # OSX ignores
 .DS_Store
+
+# Python ignores
+env/

docs/README.md

@@ -4,11 +4,25 @@ The documentation is built using [Sphinx](https://www.sphinx-doc.org/en/master/)
 
 ## Requirements
 
-To build the documentation, you will need to install a few Python packages,
-which you can do with the following command:
+To build the documentation, you will first need to create a Python virtual
+environment so you can install packages without affecting your system:
 
 ```bash
-python3 -m pip install -r requirements.txt
+python3 -m venv env
+```
+
+Then, activate the environment and install the necessary packages:
+
+```bash
+source env/bin/activate
+pip3 install -r requirements.txt
+```
+
+Once you are done building the documentation, you can then use `deactivate` at
+any time to exit out of the virtual environment:
+
+```bash
+deactivate
 ```
 
 ## Building
@@ -23,7 +37,8 @@ To build the documentation on Windows:
 make.bat html
 ```
 
-You can then visit the documentation by opening `_build/html/index.html` in the web browser of your choice.
+You can then view the documentation by opening `_build/html/index.html` in the
+web browser of your choice.
 
 ## Cleaning
 

game/Translations/extract_pot.sh

@@ -1,7 +1,14 @@
 #!/bin/bash
 
+# NOTE: This script needs to be run within a Python virtual environment (venv):
+#
+# python3 -m venv env
+# source env/bin/activate
+# ./extract_pot.sh
+# deactivate
+
 # Install the Python packages.
-python3 -m pip install -r requirements.txt
+pip3 install -r requirements.txt
 
 # Extract the .pot file.
 pybabel extract -F babelrc.txt -k text -k LineEdit/placeholder_text -k tr \