diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index e868934e55a..a5cb9bf7d35 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -1466,6 +1466,7 @@ abstract class CommonDocGenerator
                     // save curent cell padding
                     $curentCellPaddinds = $pdf->getCellPaddings();
 
+                    // Add space for lines (more if we need to show a second alternative language)
                     global $outputlangsbis;
                     if (is_object($outputlangsbis)) {
                         // set cell padding with column title definition
@@ -1480,8 +1481,8 @@ abstract class CommonDocGenerator
                     $textWidth = $colDef['width'];
                     $pdf->MultiCell($textWidth, 2, $colDef['title']['label'], '', $colDef['title']['align']);
 
-
-                    if (is_object($outputlangsbis)) {
+                    // Add variant of translation if $outputlangsbis is an object
+                    if (is_object($outputlangsbis) && trim($colDef['title']['label'])) {
                         $pdf->setCellPaddings($colDef['title']['padding'][3], 0, $colDef['title']['padding'][1], $colDef['title']['padding'][2]);
                     	$pdf->SetXY($colDef['xStartPos'], $pdf->GetY());
                     	$textbis = $outputlangsbis->transnoentities($colDef['title']['textkey']);
@@ -1495,6 +1496,7 @@ abstract class CommonDocGenerator
                 }
             }
         }
+
         return $this->tabTitleHeight;
     }
 
diff --git a/htdocs/core/modules/facture/doc/pdf_sponge.modules.php b/htdocs/core/modules/facture/doc/pdf_sponge.modules.php
index 6fad6fc4665..8f48f31fddb 100644
--- a/htdocs/core/modules/facture/doc/pdf_sponge.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_sponge.modules.php
@@ -1272,7 +1272,15 @@ class pdf_sponge extends ModelePDFFactures
 
         $default_font_size = pdf_getPDFFontSize($outputlangs);
 
-		$tab2_top = $posy;
+        $outputlangsbis = null;
+        if (!empty($conf->global->PDF_USE_ALSO_LANGUAGE_CODE) && $outputlangs->defaultlang != $conf->global->PDF_USE_ALSO_LANGUAGE_CODE) {
+        	$outputlangsbis = new Translate('', $conf);
+        	$outputlangsbis->setDefaultLang($conf->global->PDF_USE_ALSO_LANGUAGE_CODE);
+        	$outputlangsbis->loadLangs(array("main", "dict", "companies", "bills", "products", "propal"));
+        	$default_font_size--;
+        }
+
+        $tab2_top = $posy;
 		$tab2_hl = 4;
 		$pdf->SetFont('', '', $default_font_size - 1);
 
@@ -1287,13 +1295,6 @@ class pdf_sponge extends ModelePDFFactures
 		$useborder = 0;
 		$index = 0;
 
-		$outputlangsbis = null;
-		if (!empty($conf->global->PDF_USE_ALSO_LANGUAGE_CODE) && $outputlangs->defaultlang != $conf->global->PDF_USE_ALSO_LANGUAGE_CODE) {
-			$outputlangsbis = new Translate('', $conf);
-			$outputlangsbis->setDefaultLang($conf->global->PDF_USE_ALSO_LANGUAGE_CODE);
-			$outputlangsbis->loadLangs(array("main", "dict", "companies", "bills", "products", "propal"));
-		}
-
 		// Add trigger to allow to edit $object
 		$parameters = array(
 			'object' => &$object,
@@ -1708,7 +1709,7 @@ class pdf_sponge extends ModelePDFFactures
 					$index++;
 					$pdf->SetXY($col1x, $tab2_top + $tab2_hl * $index);
 
-					$retainedWarrantyToPayOn = $outputlangs->transnoentities("RetainedWarranty").' ('.$object->retained_warranty.'%)';
+					$retainedWarrantyToPayOn = $outputlangs->transnoentities("RetainedWarranty").(is_object($outputlangsbis) ? ' / '.$outputlangsbis->transnoentities("RetainedWarranty") : '').' ('.$object->retained_warranty.'%)';
 					$retainedWarrantyToPayOn .= !empty($object->retained_warranty_date_limit) ? ' '.$outputlangs->transnoentities("toPayOn", dol_print_date($object->retained_warranty_date_limit, 'day')) : '';
 
 					$pdf->MultiCell($col2x - $col1x, $tab2_hl, $retainedWarrantyToPayOn, $useborder, 'L', 1);
@@ -2028,7 +2029,12 @@ class pdf_sponge extends ModelePDFFactures
 		$posy += 4;
 		$pdf->SetXY($posx, $posy);
 		$pdf->SetTextColor(0, 0, 60);
-		$pdf->MultiCell($w, 3, $outputlangs->transnoentities("DateInvoice")." : ".dol_print_date($object->date, "day", false, $outputlangs), '', 'R');
+
+		$title = $outputlangs->transnoentities("DateInvoice");
+		if (!empty($conf->global->PDF_USE_ALSO_LANGUAGE_CODE) && is_object($outputlangsbis)) {
+			$title .= ' - '.$outputlangsbis->transnoentities("DateInvoice");
+		}
+		$pdf->MultiCell($w, 3, $title." : ".dol_print_date($object->date, "day", false, $outputlangs), '', 'R');
 
 		if (!empty($conf->global->INVOICE_POINTOFTAX_DATE))
 		{
@@ -2043,7 +2049,11 @@ class pdf_sponge extends ModelePDFFactures
 			$posy += 3;
 			$pdf->SetXY($posx, $posy);
 			$pdf->SetTextColor(0, 0, 60);
-			$pdf->MultiCell($w, 3, $outputlangs->transnoentities("DateDue")." : ".dol_print_date($object->date_lim_reglement, "day", false, $outputlangs, true), '', 'R');
+			$title = $outputlangs->transnoentities("DateDue");
+			if (!empty($conf->global->PDF_USE_ALSO_LANGUAGE_CODE) && is_object($outputlangsbis)) {
+				$title .= ' - '.$outputlangsbis->transnoentities("DateDue");
+			}
+			$pdf->MultiCell($w, 3, $title." : ".dol_print_date($object->date_lim_reglement, "day", false, $outputlangs, true), '', 'R');
 		}
 
 		if ($object->thirdparty->code_client)