first commit

wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-list-vertical/config.json

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+{
+  "name" : "Vertical List",
+  "slug" : "wpml-legacy-vertical-list",
+  "for"  : [ "sidebars", "footer", "shortcode_actions" ]
+}

wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-list-vertical/style.css

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+.wpml-ls-legacy-list-vertical {
+  display: table;
+  max-width: 100%;
+  border: 1px solid transparent;
+  border-bottom: 0; }
+  .wpml-ls-legacy-list-vertical > ul {
+    position: relative;
+    padding: 0;
+    margin: 0 !important;
+    list-style-type: none; }
+  .wpml-ls-legacy-list-vertical .wpml-ls-item {
+    padding: 0;
+    margin: 0;
+    list-style-type: none; }
+  .wpml-ls-legacy-list-vertical a {
+    display: block;
+    text-decoration: none;
+    border-bottom: 1px solid transparent;
+    padding: 5px 10px;
+    line-height: 1; }
+    .wpml-ls-legacy-list-vertical a span {
+      vertical-align: middle; }
+  .wpml-ls-legacy-list-vertical .wpml-ls-flag {
+    display: inline;
+    vertical-align: middle; }
+  .wpml-ls-legacy-list-vertical .wpml-ls-flag + span {
+    margin-left: .4em; }
+    .rtl .wpml-ls-legacy-list-vertical .wpml-ls-flag + span {
+      margin-left: 0;
+      margin-right: .4em; }
+  .wpml-ls-legacy-list-vertical.wpml-ls-statics-footer {
+    margin-bottom: 30px; }

wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-list-vertical/style.min.css

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+.wpml-ls-legacy-list-vertical{display:table;max-width:100%;border:1px solid transparent;border-bottom:0}.wpml-ls-legacy-list-vertical>ul{position:relative;padding:0;margin:0!important;list-style-type:none}.wpml-ls-legacy-list-vertical .wpml-ls-item{padding:0;margin:0;list-style-type:none}.wpml-ls-legacy-list-vertical a{display:block;text-decoration:none;border-bottom:1px solid transparent;padding:5px 10px;line-height:1}.wpml-ls-legacy-list-vertical a span{vertical-align:middle}.wpml-ls-legacy-list-vertical .wpml-ls-flag{display:inline;vertical-align:middle}.wpml-ls-legacy-list-vertical .wpml-ls-flag+span{margin-left:.4em}.rtl .wpml-ls-legacy-list-vertical .wpml-ls-flag+span{margin-left:0;margin-right:.4em}.wpml-ls-legacy-list-vertical.wpml-ls-statics-footer{margin-bottom:30px}

wp-content/plugins/sitepress-multilingual-cms/templates/language-switchers/legacy-list-vertical/template.twig

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+{% set css_classes_flag    = ('wpml-ls-flag ' ~ backward_compatibility.css_classes_flag)|trim %}
+{% set css_classes_native  = ('wpml-ls-native ' ~ backward_compatibility.css_classes_native)|trim %}
+{% set css_classes_display = ('wpml-ls-display ' ~ backward_compatibility.css_classes_display)|trim %}
+{% set css_classes_bracket = ('wpml-ls-bracket ' ~ backward_compatibility.css_classes_bracket)|trim %}
+{% set css_classes_link    = (css_classes_link ~ ' ' ~ language.backward_compatibility.css_classes_a)|trim %}
+
+<div class="{{ css_classes }} wpml-ls-legacy-list-vertical"{% if backward_compatibility.css_id %} id="{{ backward_compatibility.css_id }}"{% endif %}>
+	<ul>
+
+		{% for code, language in languages %}
+			<li class="{{ language.css_classes }} wpml-ls-item-legacy-list-vertical">
+				<a href="{{ language.url }}" class="{{ css_classes_link }}">
+                    {% include 'flag.twig' %}
+
+					{%- if language.is_current and (language.native_name or language.display_name)  -%}
+
+						{%- set current_language_name = language.native_name|default(language.display_name) -%}
+						<span class="{{ css_classes_native }}">{{- current_language_name -}}</span>
+
+					{%- else -%}
+
+						{%- if language.native_name -%}
+							<span class="{{ css_classes_native }}" lang="{{ language.code }}">{{- language.native_name -}}</span>
+						{%- endif -%}
+
+						{%- if language.display_name and (language.display_name != language.native_name) -%}
+							<span class="{{ css_classes_display }}">
+							{%- if language.native_name -%}<span class="{{ css_classes_bracket }}"> (</span>{%- endif -%}
+								{{- language.display_name -}}
+							{%- if language.native_name -%}<span class="{{ css_classes_bracket }}">)</span>{%- endif -%}
+							</span>
+						{%- endif -%}
+
+					{%- endif -%}
+				</a>
+			</li>
+		{% endfor %}
+
+	</ul>
+</div>