Some text not translated when non-default language buttons are pressed

[AmyMikhail]

Problem statement:

All required translations are available in the translation.json file. However, some text is still not being translated when a non-English language button is clicked - specifically:

• 'Choose shapefile' button label
• 'Select region name column' drop-down menu title
• 'Select region code column' drop-down menu title
• 'Download results' download button label
• All text elements of the DT table

All the items that are not being translated are uiOutput() or DTOutput() while the items that are successfully translated are input buttons. Note that the output elements change based on user input (the two drop-down menus only appear and are populated when the user selects a shapefile to upload, the DT table is only populated when the user clicks on points on the map and annotates them with an ID).

[AmyMikhail]

Fixed with merge request from @temuulene