Propagate a custom error message from the hook

Problem Definition

Upon using PreRepositoryHook veto message from this hook is not propagate a custom error message from the hook when committing file via the UI(online editor), the JS does not permit to pass any message from the hook. This is due to the code for commit-dialog.js has hardcoded only one message:

webapp/default/src/main/frontend/static/bitbucket/internal/feature/file-content/edit/commit-dialog/commit-dialog.js

This somehow rather falls back to printing the default errors:

AJS.I18n.getText('bitbucket.web.sourceview.edit.error.forcePR.message'),
AJS.I18n.getText('bitbucket.web.sourceview.edit.error.branchPermission.title')

Suggested Solution

Propagated the custom error message from the hook when committing files via the online editor in Bitbucket Server UI.