fix(UI): more specific import info

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

src/modules/modals/Import.vue

@@ -41,7 +41,7 @@
 						<p class="span">
 							{{ t('tables', 'Supported formats: xlsx, xls, csv, html, xml') }}
 							<br>
-							{{ t('tables', 'First row of the file must contain column headings.') }}
+							{{ t('tables', 'First row of the file must contain column headings without gaps.') }}
 						</p>
 					</div>
 				</RowFormWrapper>