Show plural 'files'/'folders' in progress popup

czkawka_gui/i18n/en/czkawka_gui.ftl

@@ -477,7 +477,10 @@ compute_found_broken_files = Found { $number_files } broken files
 compute_found_bad_extensions = Found { $number_files } files with invalid extensions
 
 # Progress window
-progress_scanning_general_file = Scanning {$file_number} file
+progress_scanning_general_file = {$file_number -> 
+        [one] Scanning {$file_number} file
+       *[other] Scanning {$file_number} files
+}
 
 progress_scanning_extension_of_files = Checking extension of {$file_checked}/{$all_files} file
 progress_scanning_broken_files = Checking {$file_checked}/{$all_files} file
@@ -488,7 +491,10 @@ progress_scanning_music_tags_end = Comparing tags of {$file_checked}/{$all_files
 progress_scanning_music_tags = Reading tags of {$file_checked}/{$all_files} music file
 progress_scanning_music_content_end = Comparing fingerprint of {$file_checked}/{$all_files} music file
 progress_scanning_music_content = Calculating fingerprint of {$file_checked}/{$all_files} music file
-progress_scanning_empty_folders = Scanning {$folder_number} folder
+progress_scanning_empty_folders = {$folder_number -> 
+        [one] Scanning {$folder_number} folder
+       *[other] Scanning {$folder_number} folders
+}
 progress_scanning_size = Scanning size of {$file_number} file
 progress_scanning_size_name = Scanning name and size of {$file_number} file
 progress_scanning_name = Scanning name of {$file_number} file