[Crowdin] garbage strings only in some language files

[kaktusus]

[empty string] - this one appears only in the Japanese, Polish and Basque language file.

https://crowdin.com/editor/freecad/549/en-ja?view=comfortable&filter=basic&value=0#q=%5Bempty%20string%5D
https://crowdin.com/editor/freecad/549/en-pl?view=comfortable&filter=basic&value=0#q=%5Bempty%20string%5D
https://crowdin.com/editor/freecad/549/en-eu?view=comfortable&filter=basic&value=0#q=%5Bempty%20string%5D
No string in code source files.

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<empty> - this one comes in various language files.

https://crowdin.com/editor/freecad/549/en-ja?view=comfortable&filter=basic&value=0#q=%3Cempty%3E
https://crowdin.com/editor/freecad/549/en-pl?view=comfortable&filter=basic&value=0#q=%3Cempty%3E
https://crowdin.com/editor/freecad/549/en-eu?view=comfortable&filter=basic&value=0#q=%3Cempty%3E
https://crowdin.com/editor/freecad/549/en-fr?view=comfortable&filter=basic&value=0#q=%3Cempty%3E

However, I did not find it in the *.ts source files.

The current situation is unusual. It is not clear where the first string came from. Is the only way to remove it is to edit the *.ts source files?

[kaktusus]

Form - There is only one occurrence in the translation source file (Sketcher.ts).

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There are from one to several (up to five) occurrences in the translation files of each language.

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In Crowdin we have only two occurrences.

https://crowdin.com/editor/freecad/all/en-pl?view=comfortable&filter=basic&value=0#q=Form
https://crowdin.com/editor/freecad/all/en-eu?view=comfortable&filter=basic&value=0#q=Form
https://crowdin.com/editor/freecad/all/en-fr?view=comfortable&filter=basic&value=0#q=Form
https://crowdin.com/editor/freecad/all/en-srcs?view=comfortable&filter=basic&value=0#q=Form