[CONFSERVER-28971] Instructional text in Blueprints loses umlauts and other characters, when saving

When translating the blueprints into german, you have the effect that umlauts that are contained in the instructional text are not saved.

See attachments for a visual "proof" of the problem:

(a) go as administrator to change a global template
(b) insert umlauts in the instructional text and elsewhere
(c) save the template, and edit it again: umlauts are lost in instructional text (but present in the "normal" template text
(d) created pages from the template also do not contain the "missing" umlauts

This makes this feature nearly unusable in an internationalized environment, at least in germany.

Test umlauts as well as Japanese/Russian characters on text placeholders on new and existing templates
Insert variables into a template
Verify the tested characters from step 1 characters show up on template insertion page too

duplicates

CONFCLOUD-54407 instructional text in templates does not support danish characters

CONFSERVER-29054 Instructional Text in template does not support foreign language characters

is duplicated by

CONFSERVER-29554 German umlauts get deleted in instructional text of global templates

CONFSERVER-28761 Special characters like "ë é è" are not saved correctly in the instructional text in a User Created Templates

CONFSERVER-30623 instructional text in templates doesn't show mutated vowels

(3 mentioned in)

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