Prevent gettext() from binding to _ namespace

[caronc]

Description:

Related issue (if applicable): #807

Python states that while it provides the gettext.install() function (to install translations globally into the built-in (_), it isn't ideal as the last person who calls this over-rides the global built-in. Basically system can do this, but plugins like Apprise should not.

---

Python Official Reference
Key quote to take away from above link:

localized modules should never install _(). Instead, they should use this code to make _() available to their module:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@807-gettext-namespacing

# Test out the changes with the following command:
apprise -vvvv -l

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (5fd568f) 99.51% compared to head (deec3f9) 99.52%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #821      +/-   ##
==========================================
+ Coverage   99.51%   99.52%   +0.01%     
==========================================
  Files         123      123              
  Lines       16345    16360      +15     
  Branches     3329     3329              
==========================================
+ Hits        16266    16283      +17     
+ Misses         70       68       -2     
  Partials        9        9              

Files Changed	Coverage Δ
apprise/AppriseLocale.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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