Use instance name as alt-text

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/Mail/EMailTemplate.php

@@ -98,7 +98,7 @@ EOF;
 							<tbody>
 							<tr style="padding:0;text-align:left;vertical-align:top">
 								<center data-parsed="" style="min-width:580px;width:100%%">
-									<img class="logo float-center" src="%s" alt="logo" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
+									<img class="logo float-center" src="%s" alt="%s" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
 								</center>
 							</tr>
 							</tbody>
@@ -328,7 +328,7 @@ EOF;
 		$this->headerAdded = true;
 
 		$logoUrl = $this->urlGenerator->getAbsoluteURL($this->themingDefaults->getLogo());
-		$this->htmlBody .= vsprintf($this->header, [$this->themingDefaults->getColorPrimary(), $logoUrl]);
+		$this->htmlBody .= vsprintf($this->header, [$this->themingDefaults->getColorPrimary(), $logoUrl, $this->themingDefaults->getName()]);
 	}
 
 	/**

tests/data/emails/new-account-email-custom.html

@@ -23,7 +23,7 @@
 							<tbody>
 							<tr style="padding:0;text-align:left;vertical-align:top">
 								<center data-parsed="" style="min-width:580px;width:100%">
-									<img class="logo float-center" src="https://example.org/img/logo-mail-header.png" alt="logo" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
+									<img class="logo float-center" src="https://example.org/img/logo-mail-header.png" alt="TestCloud" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
 								</center>
 							</tr>
 							</tbody>

tests/data/emails/new-account-email-single-button.html

@@ -23,7 +23,7 @@
 							<tbody>
 							<tr style="padding:0;text-align:left;vertical-align:top">
 								<center data-parsed="" style="min-width:580px;width:100%">
-									<img class="logo float-center" src="https://example.org/img/logo-mail-header.png" alt="logo" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
+									<img class="logo float-center" src="https://example.org/img/logo-mail-header.png" alt="TestCloud" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
 								</center>
 							</tr>
 							</tbody>

tests/data/emails/new-account-email.html

@@ -23,7 +23,7 @@
 							<tbody>
 							<tr style="padding:0;text-align:left;vertical-align:top">
 								<center data-parsed="" style="min-width:580px;width:100%">
-									<img class="logo float-center" src="https://example.org/img/logo-mail-header.png" alt="logo" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
+									<img class="logo float-center" src="https://example.org/img/logo-mail-header.png" alt="TestCloud" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;max-height:100%;max-width:100px;outline:0;text-align:center;text-decoration:none;width:auto">
 								</center>
 							</tr>
 							</tbody>

tests/lib/Mail/EMailTemplateTest.php

@@ -62,6 +62,10 @@ class EMailTemplateTest extends TestCase {
 			->expects($this->any())
 			->method('getLogo')
 			->willReturn('/img/logo-mail-header.png');
+		$this->defaults
+			->expects($this->any())
+			->method('getName')
+			->willReturn('TestCloud');
 		$this->urlGenerator
 			->expects($this->once())
 			->method('getAbsoluteURL')