CI: Add automatic PR creation for source string updates (#4544)

* wording

* add pr creation

* Update translations.yml

* Update translations.yml

* update translation workflow

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* skip ci update

* skip ci update

* update conditions

* remove empty line

* typo

* tee test

* cleanup

* pass data between steps

* opt for step output over env variable

* remove space

* create script

* wording

* fix fork protection, re-add pr run

* updates

* Update translations.yml

* adjust for new source paths

* update comment

* wording

Co-authored-by: ebbit1q <ebbit1q@gmail.com>

* wording

* reorder

* reorder

* fix deprecation of set-output

* fix version

---------

Co-authored-by: ebbit1q <ebbit1q@gmail.com>

.ci/update_translations_template.md

@@ -0,0 +1,11 @@
+Updated language source strings:
+- {{ .cockatrice_output }} (Cockatrice)
+- {{ .oracle_output }} (Oracle)
+
+<br>
+
+Last changes are based on commit {{ .commit }}.
+
+---
+*This PR is automatically generated and updated by the workflow at `.github/workflows/translations.yml`.*<br>
+*After merging, all changes to the source language are available for translation at [Transifex](https://www.transifex.com/projects/p/cockatrice/) shortly.*