[4.3] Re-add minus to allowed filenames in com_templates

[ManuelHu]

Pull Request for Issue #41368.

Summary of Changes

re-add the minus sign to the list of allowed characters, that had been removed in PR #38987.

It restores the behavior that is also described in the error message for in valid filenames.

Testing Instructions

• Open a template in the com_templates file browser
• Try to create a (e.g. PHP) file that contains a minus sign, e.g. enter contains-minus as a file name

Actual result BEFORE applying this Pull Request

The file is not created, and an error message is shown:

joomla-cms/administrator/language/en-GB/com_templates.ini

Line 158 in ae2a409

COM_TEMPLATES_INVALID_FILE_NAME="Invalid file name. Please choose a file name with a-z, A-Z, 0-9, ., - and _."

Expected result AFTER applying this Pull Request

The file contains-minus.php is created. This is a totally valid filename.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[Quy]

I have tested this item ✅ successfully on 7dbd75e

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[Fedik]

I have tested this item ✅ successfully on 7dbd75e

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/41369.}

[Fedik]

r2c

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[rachelwalraven]

I have tested this item ✅ successfully on 1546592

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/41369.}

[obuisard]

Thank you Manuel @ManuelHu for the rectification!