SLING-10654: add test content for icu plural test (#4)

Including:
 - some format expressions and data being used for the same
 - some translations of the pattern used in a non-trivial language
diff --git a/src/main/resources/SLING-INF/apps/sightly/locales/cs.json b/src/main/resources/SLING-INF/apps/sightly/locales/cs.json
new file mode 100644
index 0000000..fb62664
--- /dev/null
+++ b/src/main/resources/SLING-INF/apps/sightly/locales/cs.json
@@ -0,0 +1,10 @@
+{
+    "jcr:primaryType": "nt:unstructured",
+    "jcr:mixinTypes": [ "mix:language" ],
+    "jcr:language": "cs",
+    "results-plural": {
+        "jcr:primaryType": "sling:MessageEntry",
+        "sling:key": "{0,plural,one{# result} other{# results}}",
+        "sling:message": "{0,plural,one{# výsledek} few{# výsledky} other{# výsledků}}"
+    }
+}
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diff --git a/src/main/resources/SLING-INF/apps/sightly/scripts/format/FormatPojo.java b/src/main/resources/SLING-INF/apps/sightly/scripts/format/FormatPojo.java
index 394d68b..8597538 100644
--- a/src/main/resources/SLING-INF/apps/sightly/scripts/format/FormatPojo.java
+++ b/src/main/resources/SLING-INF/apps/sightly/scripts/format/FormatPojo.java
@@ -29,4 +29,19 @@
         return date;
     }
 
+    public int getZero() {
+        return 0;
+    }
+
+    public int getOne() {
+        return 1;
+    }
+
+    public int getFew() {
+        return 3;
+    }
+
+    public int getMany() {
+        return 15;
+    }
 }
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diff --git a/src/main/resources/SLING-INF/apps/sightly/scripts/format/format.html b/src/main/resources/SLING-INF/apps/sightly/scripts/format/format.html
index 790144a..18538f4 100644
--- a/src/main/resources/SLING-INF/apps/sightly/scripts/format/format.html
+++ b/src/main/resources/SLING-INF/apps/sightly/scripts/format/format.html
@@ -19,4 +19,13 @@
 <p id="format-date-2">${'short' @ format=pojo.date, timezone='UTC', locale='de_DE', type='date'}</p>
 <p id="format-date-3">${'short' @ format=pojo.date, timezone='UTC', locale='de_DE'}</p>
 <p id="format-date-4">${'FULL' @ format=pojo.date, timezone='UTC', locale='de_DE', type='date'}</p>
+
+<p id="format-icu-plural-zero">${'{0,plural,one{# result} other{# results}}' @ format=pojo.zero, locale='en', i18n }</p>
+<p id="format-icu-plural-one">${'{0,plural,one{# result} other{# results}}' @ format=pojo.one, locale='en', i18n }</p>
+<p id="format-icu-plural-few">${'{0,plural,one{# result} other{# results}}' @ format=pojo.few, locale='en', i18n }</p>
+<p id="format-icu-plural-many">${'{0,plural,one{# result} other{# results}}' @ format=pojo.many, locale='en', i18n }</p>
+<p id="format-icu-plural-zero-cs">${'{0,plural,one{# result} other{# results}}' @ format=pojo.zero, locale='cs', i18n }</p>
+<p id="format-icu-plural-one-cs">${'{0,plural,one{# result} other{# results}}' @ format=pojo.one, locale='cs', i18n }</p>
+<p id="format-icu-plural-few-cs">${'{0,plural,one{# result} other{# results}}' @ format=pojo.few, locale='cs', i18n }</p>
+<p id="format-icu-plural-many-cs">${'{0,plural,one{# result} other{# results}}' @ format=pojo.many, locale='cs', i18n }</p>
 </div>
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