[Share By Email] Load translations on configuration page

[JamBalaya56562]

Summary

• register Share By Email translations when FreshRSS opens the extension configuration page
• keep the existing translation registration during normal extension initialization
• bump the extension version to 0.3.6

Fixes #390

Root cause

FreshRSS invokes handleConfigureAction() when rendering an extension's configuration page. Share By Email only registered its translations from init(), so the configuration template could render before the extension translation namespace was available and expose keys such as shareByEmail.share.manage.mailer.

Visual comparison

Both screenshots use FreshRSS 1.29.2-dev, the Origine light theme, English UI, and a 1280×720 viewport.

Before	After

Validation

• confirmed the configuration GET renders Mailing system, the active mailer, and the translated help text
• confirmed normal extension initialization still registers translations for sharing and feedback messages
• npm run eslint
• npx stylelint "**/*.css"
• npm run markdownlint