File Manager: Fix small UI/UX bugs like breadcrumb path copy, translation wrapper, etc. and add small features

[mgutt]

There are some tiny problems with the File Manager UI/UX:

• Right-clicking the breadcrumb and copying the path adds an unwanted linebreak at the end, which is annoying when pasting into terminals or other applications.
• Error messages like "Cannot move directory into its own subdirectory" are hardcoded English strings, preventing localization.
• this PR caused problems with the Markdown Parser leaving a single :

• width of permission selection is too small:

And maybe some enhancements could be realized, too:

• manually typing a destination path does not update the filetree browser accordingly
• offering auto-completion while manually typing a path (maybe displaying them as additional path in the filetree browser?)
• show total size of a running transfer
• show the last N used destination paths in the filetree browser
• add "Open Terminal here" button

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