Take advantage of PHP 5.4+ short echo (#2585)

* Take advantage of PHP 5.4+ short echo

https://php.net/migration54.new-features thanks to
https://github.com/FreshRSS/FreshRSS/pull/2495

Use `<?=  ?>` instead of `<?php echo; ?>`
10kB of code saved :-)

Done with regular expression:
```
<\?php echo (.+?);? *\?>
<?= \1 ?>
```

* Try Travis fix

https://github.com/squizlabs/PHP_CodeSniffer/issues/2045#issuecomment-395238272

2 files changed, 10 insertions, 10 deletions

diff --git a/app/views/helpers/extension/configure.phtml b/app/views/helpers/extension/configure.phtml
index cde872aa0..cb6ebd6bb 100644
--- a/app/views/helpers/extension/configure.phtml
+++ b/app/views/helpers/extension/configure.phtml
@@ -1,19 +1,19 @@
 <div class="post">
 	<h1>
-		<?php echo $this->extension->getName(); ?> (<?php echo $this->extension->getVersion(); ?>) —
+		<?= $this->extension->getName() ?> (<?= $this->extension->getVersion() ?>) —
 		<?php echo $this->extension->isEnabled() ? _t('admin.extensions.enabled')
 		                                         : _t('admin.extensions.disabled'); ?>
 	</h1>
 
-	<p class="alert alert-warn"><?php echo $this->extension->getDescription(); ?> — <?php echo _t('gen.short.by_author'), ' ', $this->extension->getAuthor(); ?></p>
+	<p class="alert alert-warn"><?= $this->extension->getDescription() ?> — <?= _t('gen.short.by_author'), ' ', $this->extension->getAuthor() ?></p>
 
-	<h2><?php echo _t('gen.action.manage'); ?></h2>
+	<h2><?= _t('gen.action.manage') ?></h2>
 	<?php
 		$configure_view = $this->extension->getConfigureView();
 		if ($configure_view !== false) {
 			echo $configure_view;
 		} else {
 	?>
-	<p class="alert alert-warn"><?php echo _t('admin.extensions.no_configure_view'); ?></p>
+	<p class="alert alert-warn"><?= _t('admin.extensions.no_configure_view') ?></p>
 	<?php } ?>
 </div>
diff --git a/app/views/helpers/extension/details.phtml b/app/views/helpers/extension/details.phtml
index acba4e816..ed9674e3d 100644
--- a/app/views/helpers/extension/details.phtml
+++ b/app/views/helpers/extension/details.phtml
@@ -3,19 +3,19 @@
 		<?php if ($this->ext_details->getType() === 'user' || FreshRSS_Auth::hasAccess('admin')) { ?>
 		<?php $name_encoded = urlencode($this->ext_details->getName()); ?>
 		<div class="stick">
-			<a class="btn open-slider" href="<?php echo _url('extension', 'configure', 'e', $name_encoded); ?>"><?php echo _i('configure'); ?> <?php echo _t('gen.action.manage'); ?></a>
+			<a class="btn open-slider" href="<?= _url('extension', 'configure', 'e', $name_encoded) ?>"><?= _i('configure') ?> <?= _t('gen.action.manage') ?></a>
 			<?php if ($this->ext_details->isEnabled()) { ?>
-			<button class="btn active" form="form-extension" formaction="<?php echo _url('extension', 'disable', 'e', $name_encoded); ?>"><?php echo _t('gen.action.disable'); ?></button>
+			<button class="btn active" form="form-extension" formaction="<?= _url('extension', 'disable', 'e', $name_encoded) ?>"><?= _t('gen.action.disable') ?></button>
 			<?php } else { ?>
-			<button class="btn" form="form-extension" formaction="<?php echo _url('extension', 'enable', 'e', $name_encoded); ?>"><?php echo _t('gen.action.enable'); ?></button>
+			<button class="btn" form="form-extension" formaction="<?= _url('extension', 'enable', 'e', $name_encoded) ?>"><?= _t('gen.action.enable') ?></button>
 			<?php } ?>
 			<?php if (FreshRSS_Auth::hasAccess('admin')) { ?>
-			<button class="btn btn-attention confirm" form="form-extension" formaction="<?php echo _url('extension', 'remove', 'e', $name_encoded); ?>"><?php echo _t('gen.action.remove'); ?></button>
+			<button class="btn btn-attention confirm" form="form-extension" formaction="<?= _url('extension', 'remove', 'e', $name_encoded) ?>"><?= _t('gen.action.remove') ?></button>
 			<?php } ?>
 		</div>
 		<?php } else { ?>
-		<?php echo _t('admin.extensions.system.no_rights'); ?>
+		<?= _t('admin.extensions.system.no_rights') ?>
 		<?php } ?>
 	</li>
-	<li class="item"><?php echo $this->ext_details->getName(); ?></li>
+	<li class="item"><?= $this->ext_details->getName() ?></li>
 </ul>