Merge tag '2.1.10' into develop

Tagging version 2.1.10 2.1.10
[TASK] Added new behavior test

Two AJAX forms  on one page

2.1.10
[TASK] Updated FAQ section in manual
[TASK] Updated parsley.js from version 2.0.5 to 2.0.6
Small test
[BUGFIX] Textarea field in RTE without linebreaks

rewrite -&gt; to -> in VariablesViewHelper

related: #43502
[BUGFIX] wrong HTML5-pattern for "letters only"

letters only pattern now [a-zA-Z]+ for JS, HTML5 and PHP now

related: #63339
[BUGFIX] Detail view sorting is ignored

rewritten findByUids method as workarround to keep flexform sorting

related: #63797
[BUGFIX] Detail view sorting is ignored

OutputController with array annotations to get the  export work

related: #63797
[BUGFIX] Detail view sorting is ignored

OutputController with array annotations to get the  export work CSV

related: #63797
[BUGFIX] Captcha Not Working

Removed outdated TSFE function getTemplate() when it's not neccessary

related: #63972
[BUGFIX] can't edit field type in localized field

Displaycond removed and language fallback in TCA for fieldtype inserted

related: #63766
[BUGFIX] Captcha Not Working

Small refactoring of the CalculatingCaptcha Class for automatic tests

related: #63972
[BUGFIX] Captcha Not Working

Unit Tests for CalculatingCaptcha

related: #63972
[BUGFIX] wrong HTML5-pattern for "letters only"

updated unit test for umlauts

related: #63339
[BUGFIX] frontend editing does not fit to assigned user

Fixed isAllowedToEdit() Function

related: #63796
Merge branch 'feature/63766_fieldtype' into develop
[BUGFIX] Export Exclude Fields

ViewHelper added, HTML-Templates adjusted, Small change in SASS and CSS

related: #63933
Merge branch 'develop' into feature/63933_export_enable_fields
Merge branch 'feature/63796_pi2_edit' into develop