Check if file exists before processing

While collecting translations, sometimes a file that is deleted is being handled, and causes a breaking error.
Now checking if file exists before processing.

JS translations keep working after import (not resetting locale)

Previously we found out that after importing the new translations the
JSON file that is used for Javascript translations was reverted to the
default language.

To prevent this we now generate the translation file again for the
specific locale after importing.

Magento 2.3.3 compatibility

2.1.9

Merge pull request #16 from experius/bugfix/adminhtml-breaks-due-to-c…

Admin url fix

Merge pull request #15 from experius/ISSUE14

[BUGFIX] Fixed module not working on adminurl's other than 'storemana…

2.1.6: Merge pull request #11 from experius/acl-fix

[BUGFIX] Fixed acl not being properly defined for controllers

2.1.5: Merge pull request #10 from thokiller/thokiller-patch-1

Bugfix Empty phrase en instanceof phrase

README Update

Merge pull request #5 from experius/readme-update

[DOCS] Updated the README.md with clear information

[FEATURE] Js translation feature added and cronjobs are now configurable

Merge pull request #2 from experius/js-translation-feature

[FEATURE] Js translation feature added and cronjobs are now configurable

[MAJOR] [FEATURE] Added scraper to add all translations to the database

This makes it possible for merchant/clients to translate any string in the adminpanel of Magento.

• Added Console command to scrape all translations
• Added crontab to insert new translations nightly at 3:13 AM (i.e. if new module is installed or translatable strings changed)
• Minor UX / syntax improvements in loose commits