Rewrite PHP opening tags (#7939)

This allows to remove the use of `echo` and be consistent through out the file.
Some empty PHP tags where removed as well.

app/views/index/normal.phtml

@@ -61,26 +61,23 @@ $today = @strtotime('today');
 			$this->entry->feed() ?? FreshRSS_Feed::default();
 
 		if ($display_today && $this->entry->isDay(FreshRSS_Days::TODAY, $today)) {
-			?><div class="day" id="day_today"><?php
-				echo _t('index.feed.received.today');
-				?><span class="date"> — <?= timestamptodate(time(), false) ?></span><?php
-				?><span class="name"><?= FreshRSS_Context::$name ?></span><?php
-			?></div><?php
+			?><div class="day" id="day_today"><?= _t('index.feed.received.today') ?>
+			<span class="date"> — <?= timestamptodate(time(), false) ?></span>
+			<span class="name"><?= FreshRSS_Context::$name ?></span>
+			</div><?php
 			$display_today = false;
 		}
 		if ($display_yesterday && $this->entry->isDay(FreshRSS_Days::YESTERDAY, $today)) {
-			?><div class="day" id="day_yesterday"><?php
-				echo _t('index.feed.received.yesterday');
-				?><span class="date"> — <?= timestamptodate(time() - 86400, false) ?></span><?php
-				?><span class="name"><?= FreshRSS_Context::$name ?></span><?php
-			?></div><?php
+			?><div class="day" id="day_yesterday"><?= _t('index.feed.received.yesterday') ?>
+				<span class="date"> — <?= timestamptodate(time() - 86400, false) ?></span>
+				<span class="name"><?= FreshRSS_Context::$name ?></span>
+			</div><?php
 			$display_yesterday = false;
 		}
 		if ($display_others && $this->entry->isDay(FreshRSS_Days::BEFORE_YESTERDAY, $today)) {
-			?><div class="day" id="day_before_yesterday"><?php
-				echo _t('index.feed.received.before_yesterday');
-				?><span class="name"><?= FreshRSS_Context::$name ?></span><?php
-			?></div><?php
+			?><div class="day" id="day_before_yesterday"><?= _t('index.feed.received.before_yesterday') ?>
+				<span class="name"><?= FreshRSS_Context::$name ?></span>
+			</div><?php
 			$display_others = false;
 		}
 	?><div class="flux<?= !$this->entry->isRead() ? ' not_read' : ''