fix(theme): align user menu profile label with password change page

[marevol]

Summary

When logged in, the user dropdown menu on the search screen shows a different label depending on the UI: the default JSP view displays "Change Password" (labels.profile), while the bootstrap theme displays "Profile" (nav.profile). Both link to the same /profile page, which only provides password change functionality. This PR unifies the theme menu label with the default view.

Changes Made

• Updated nav.profile in src/main/webapp/themes/bootstrap/i18n/messages.*.json (16 locales) to match the corresponding labels.profile translation in fess_label_*.properties (e.g. en: Profile -> Change Password, ja: プロファイル -> パスワード変更)
• No changes to the message key or auth.js; only the translated values were updated

Testing

• Verified all 16 JSON files remain valid after the update
• Confirmed no tests rely on the previous "Profile" label text

Breaking Changes

• None

Additional Notes

• The "Change Password" wording follows the existing label introduced by Add Change Password page #370, since the /profile page only implements password changes. The theme's own page title (profile.title) already uses "Change Password", so this also resolves an inconsistency within the theme itself.
• A companion PR applies the same fix to the docuforge theme in the fess-themes repository.