If the translation does not have a <source></source>, can it be used for translation?<context>
<name>Gui::Dialog::AboutApplication</name>
<message>
<source>About</source>
<translation>О программе</translation>
</message>
<message>
<source>Revision number</source>
<translation>Номер редакции</translation>
</message>
<message>
<source>Version</source>
<translation>Версия</translation>
</message>
<message>
<source>OK</source>
<translation>OK</translation>
</message>
<message>
<source/>
<translation>О программе</translation>
</message>
<message>
<source>Release date</source>
<translation>Дата выпуска</translation>
</message>
<message>
<source>Copy to clipboard</source>
<translation>Скопировать в буфер обмена</translation>
</message>
<message>
<source>Operating system</source>
<translation>Операционная система</translation>
</message>
<message>
<source>Word size</source>
<translation>Размер слова</translation>
</message>
<message>
<source>License</source>
<translation>Лицензия</translation>
</message>
</context>
looks like mistake.
17 strings of this form presented in FreeCAD.ts. In other *.ts files this strings are not presented.
№, file , context
1, 'FreeCAD.ts', 'Gui::Dialog::AboutApplication'
2, 'FreeCAD.ts', 'Gui::Dialog::DlgActivateWindow'
3, 'FreeCAD.ts', 'Gui::Dialog::DlgAuthorization'
4, 'FreeCAD.ts', 'Gui::Dialog::DlgCustomCommands'
5, 'FreeCAD.ts', 'Gui::Dialog::DlgCustomKeyboard'
6, 'FreeCAD.ts', 'Gui::Dialog::DlgCustomToolbars'
7, 'FreeCAD.ts', 'Gui::Dialog::DlgDisplayProperties'
8, 'FreeCAD.ts', 'Gui::Dialog::DlgEditorSettings'
9, 'FreeCAD.ts', 'Gui::Dialog::DlgInputDialog'
10, 'FreeCAD.ts', 'Gui::Dialog::DlgMaterialProperties'
11, 'FreeCAD.ts', 'Gui::Dialog::DlgPreferences'
12, 'FreeCAD.ts', 'Gui::Dialog::DlgProjectInformation'
13, 'FreeCAD.ts', 'Gui::Dialog::DlgReportView'
14, 'FreeCAD.ts', 'Gui::Dialog::DlgSettings3DView'
15, 'FreeCAD.ts', 'Gui::Dialog::DlgSettingsColorGradient'
16, 'FreeCAD.ts', 'Gui::Dialog::DlgTipOfTheDay'
17, 'FreeCAD.ts', 'Gui::DlgTreeWidget'