Add workaround for potential file permission issues

[swissspidy]

When loading a file such as wp-content/plugins/foo-plugin/languages/foo-plugin-de_DE.mo
If wp-content/plugins/foo-plugin/languages/foo-plugin-de_DE.mo.php cannot be created
Try creating wp-content/languages/plugins/foo-plugin-de_DE.mo.php instead

When loading a file such as wp-content/plugins/foo-plugin/languages/foo-plugin-de_DE.mo again
Look up wp-content/plugins/foo-plugin/languages/foo-plugin-de_DE.mo.php
And then look up wp-content/languages/plugins/foo-plugin-de_DE.mo.php

Ditto for themes (note the change in file name!):

When loading a file such as wp-content/themes/foo-theme/languages/de_DE.mo
If wp-content/themes/foo-theme/languages/de_DE.mo.php cannot be created
Try creating wp-content/languages/themes/foo-theme-de_DE.mo.php instead

When loading a file such as wp-content/themes/foo-theme/languages/de_DE.mo again
Look up wp-content/themes/foo-theme/languages/de_DE.mo.php
And then look up wp-content/languages/themes/foo-theme-de_DE.mo.php

Fixes #108

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (1d83d08) 95.34% compared to head (b62885d) 95.03%.

Files	Patch %	Lines
lib/class-performant-translations.php	91.66%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #109      +/-   ##
============================================
- Coverage     95.34%   95.03%   -0.32%     
- Complexity      181      195      +14     
============================================
  Files             6        6              
  Lines           430      463      +33     
============================================
+ Hits            410      440      +30     
- Misses           20       23       +3     

Flag	Coverage Δ
default	95.03% <91.66%> (-0.32%)	⬇️
multisite	36.71% <91.66%> (+4.15%)	⬆️

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[swissspidy]

Performance Test Results

Performance test results for 0e8f916 are in 🛎️!

WordPress Admin

Locale	Scenario	wp-memory-usage	wp-total
en_US	Default	17.45 MB	143.29 ms
de_DE	Default	34.35 MB	197.02 ms
de_DE	Ginger MO (MO)	22.05 MB	176.68 ms
de_DE	Ginger MO (PHP)	18.94 MB	148.28 ms

Twenty Twenty-Three

Locale	Scenario	wp-memory-usage	wp-total
en_US	Default	16.31 MB	131.80 ms
de_DE	Default	30.03 MB	170.35 ms
de_DE	Ginger MO (MO)	19.90 MB	152.55 ms
de_DE	Ginger MO (PHP)	17.55 MB	136.32 ms

Twenty Twenty-One

Locale	Scenario	wp-memory-usage	wp-total
en_US	Default	15.80 MB	107.95 ms
de_DE	Default	29.62 MB	146.50 ms
de_DE	Ginger MO (MO)	19.40 MB	132.28 ms
de_DE	Ginger MO (PHP)	17.05 MB	114.66 ms