🌐 style: improve RTL styling consistency (#381)

static/isso.css

@@ -27,8 +27,8 @@ h4.isso-thread-heading {
 }
 
 .isso-feedlink {
-    float: right;
-    padding-left: 1em;
+    float: inline-end;
+    padding-inline-start: 1em;
 }
 
 .isso-feedlink a {
@@ -52,13 +52,13 @@ h4.isso-thread-heading {
 
 .isso-comment:not(:first-of-type),
 .isso-follow-up .isso-comment {
-    margin-bottom: 0.5em;
+    margin-block-end: 0.5em;
     border-top: 1px solid var(--divider-color);
 }
 
 .isso-avatar {
     display: block;
-    float: left;
+    float: inline-start;
     margin: 0.95em 0.95em 0;
 }
 
@@ -77,7 +77,7 @@ h4.isso-thread-heading {
 }
 
 .isso-follow-up {
-    padding-left: calc(7% + 20px);
+    padding-inline-start: calc(7% + 20px);
 }
 
 .isso-comment-footer {
@@ -94,7 +94,7 @@ h4.isso-thread-heading {
 
 /* Only for comment header, spacer between up-/downvote should have no padding */
 .isso-comment-header .isso-spacer {
-    padding: 0 6px;
+    padding-inline: 6px;
 }
 
 .isso-spacer,
@@ -113,7 +113,7 @@ h4.isso-thread-heading {
 }
 
 .isso-note {
-    float: right;
+    float: inline-end;
 }
 
 .isso-author {
@@ -146,7 +146,7 @@ h4.isso-thread-heading {
 }
 
 .isso-text p:last-child {
-    margin-bottom: 0.2em;
+    margin-block-end: 0.2em;
 }
 
 .isso-text h1,
@@ -228,7 +228,7 @@ h4.isso-thread-heading {
     position: relative;
     bottom: 1px;
     vertical-align: middle;
-    margin-left: 0;
+    margin-inline-end: 0;
 }
 
 .isso-notification-section {
@@ -257,7 +257,7 @@ h4.isso-thread-heading {
 }
 
 .isso-input-wrapper {
-    margin-right: 0.5em;
+    margin-inline-end: 0.5em;
 }
 
 .isso-input-wrapper input,
@@ -289,7 +289,8 @@ h4.isso-thread-heading {
     border: none;
     border-radius: 5px;
     background-color: var(--primary-color);
-    padding: 0.6em 1em;
+    padding-inline: 1em;
+    padding-block: 0.6em;
     color: var(--background-color);
     font-size: 0.8rem;
 }