[i18n] Fix "Add a RSS feed" typo (#4161)

* [i18n] Fix "Add a RSS feed" typo

* fix the typo also in i18n/en[-us]/index.php

* moar

* moar

Co-authored-by: mathContao <math-home@web.de>

app/i18n/en-us/index.php

@@ -17,7 +17,7 @@ return array(
 		'bugs_reports' => 'Bug reports',	// IGNORE
 		'credits' => 'Credits',	// IGNORE
 		'credits_content' => 'Some design elements come from <a href="http://twitter.github.io/bootstrap/">Bootstrap</a> although FreshRSS doesn’t use this framework. <a href="https://git.gnome.org/browse/gnome-icon-theme-symbolic">Icons</a> come from <a href="https://www.gnome.org/">GNOME project</a>. <em>Open Sans</em> font police has been created by <a href="https://fonts.google.com/specimen/Open+Sans">Steve Matteson</a>. FreshRSS is based on <a href="https://github.com/marienfressinaud/MINZ">Minz</a>, a PHP framework.',	// IGNORE
-		'freshrss_description' => 'FreshRSS is a RSS feeds aggregator to self-host like <a href="http://tontof.net/kriss/feed/">Kriss Feed</a> or <a href="https://github.com/LeedRSS/Leed">Leed</a>. It is light and easy to take in hand while being powerful and configurable tool.',	// IGNORE
+		'freshrss_description' => 'FreshRSS is an RSS feed aggregator to self-host like <a href="http://tontof.net/kriss/feed/">Kriss Feed</a> or <a href="https://github.com/LeedRSS/Leed">Leed</a>. It is light and easy to take in hand while being powerful and configurable tool.',	// IGNORE
 		'github' => '<a href="https://github.com/FreshRSS/FreshRSS/issues">on Github</a>',	// IGNORE
 		'license' => 'License',	// IGNORE
 		'project_website' => 'Project website',	// IGNORE

app/i18n/en-us/sub.php

@@ -31,7 +31,7 @@ return array(
 		'title' => 'Title',	// IGNORE
 	),
 	'feed' => array(
-		'add' => 'Add a RSS feed',	// IGNORE
+		'add' => 'Add an RSS feed',	// IGNORE
 		'advanced' => 'Advanced',	// IGNORE
 		'archiving' => 'Archiving',	// IGNORE
 		'auth' => array(

app/i18n/en/index.php

@@ -17,7 +17,7 @@ return array(
 		'bugs_reports' => 'Bug reports',
 		'credits' => 'Credits',
 		'credits_content' => 'Some design elements come from <a href="http://twitter.github.io/bootstrap/">Bootstrap</a> although FreshRSS doesn’t use this framework. <a href="https://git.gnome.org/browse/gnome-icon-theme-symbolic">Icons</a> come from <a href="https://www.gnome.org/">GNOME project</a>. <em>Open Sans</em> font police has been created by <a href="https://fonts.google.com/specimen/Open+Sans">Steve Matteson</a>. FreshRSS is based on <a href="https://github.com/marienfressinaud/MINZ">Minz</a>, a PHP framework.',
-		'freshrss_description' => 'FreshRSS is a RSS feeds aggregator to self-host like <a href="http://tontof.net/kriss/feed/">Kriss Feed</a> or <a href="https://github.com/LeedRSS/Leed">Leed</a>. It is light and easy to take in hand while being powerful and configurable tool.',
+		'freshrss_description' => 'FreshRSS is an RSS feed aggregator to self-host like <a href="http://tontof.net/kriss/feed/">Kriss Feed</a> or <a href="https://github.com/LeedRSS/Leed">Leed</a>. It is light and easy to take in hand while being powerful and configurable tool.',
 		'github' => '<a href="https://github.com/FreshRSS/FreshRSS/issues">on Github</a>',
 		'license' => 'License',
 		'project_website' => 'Project website',

app/i18n/en/sub.php

@@ -31,7 +31,7 @@ return array(
 		'title' => 'Title',
 	),
 	'feed' => array(
-		'add' => 'Add a RSS feed',
+		'add' => 'Add an RSS feed',
 		'advanced' => 'Advanced',
 		'archiving' => 'Archiving',
 		'auth' => array(