[2.1] Issues with metapalettes legends containing + sign

[dmolineus]

Checklist before I submit this issue report

I confirm that:

• I have tested this with the latest version available
• [ x I have read documentation @ http://metamodels.readthedocs.org/en/ or http://metamodels.readthedocs.org/de/
• I have checked the Contao community forums for references https://community.contao.org/
• I have checked existing issues for duplicates and found none @ https://github.com/MetaModels/core/issues?q=is%3Aissue

My environment is:

(Please fill in the actual values from your environment)

Key	Value	Comments
PHP version:	7.2.14
Contao version:	4.4.35
MetaModels version:	2.1.x-dev
Installation via composer:	yes
Installed MetaModels packages:	all
DCG version:	2.1.x-dev

Issue description

See related tickets:

• /contao-community-alliance/dc-genera#49
• contao-community-alliance/meta-palettes/issues#42
• MetaModels/attribute_file#70
• MetaModels/attribute_translatedfile#25

Let's stop gambling with Github issues now but address the root of the issue. It's introduced with 06c9ecc#diff-036ec8758c82b25c5157a34d7553901bL144 where the checking for the + sign in legends got removed. The new abstraction 06c9ecc#diff-eaaa1c8727398a70154ff9f6bfd9bef9R50 doesn't contain the check. So basically the legends are created for it.

[zonky2]

fixed with 3749e03