translations: add menu item for launching translation tool
start of new tool: TranslationTool, for working on strings
TranslationTool: now able to load/save strings files
TranslationTool: add a 'Test' button to launch Micropolis with translated strings
translations: merge in my older work on the translation tool
translation-tool: stubs for additional buttons
translation-tool: abstract the table to a separate class
translation-tool: save working files in user's home directory
translation-tool: allow running from any working directory