Small changes to the translation panel

[humdinger]

• Change the window title of the translation panel to "{LANG}: #{block}", e.g. "de: #2701". It's more informative and readable in the Deskbar.

• Bold "Original Text:" and "Translated Text:".

• Add the current national flag before "Translated" to quickly indicate we're in the right language.

• In the translation panel, the links to "Translation Style Guide" and "Translation Terminology" could be shortened to just "Rules" and "Terms".

• The background of the left original-pane should be a light grey to indicate it's not editable. Oh: it already is, but not in BeZilla. Is there a work-around?