trad: Update some translate.

src/View/ui/PurgeOptions.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>194</width>
+    <width>251</width>
     <height>114</height>
    </rect>
   </property>
@@ -27,7 +27,7 @@
    <item row="0" column="0">
     <widget class="QGroupBox" name="groupBox_3">
      <property name="title">
-      <string>Number of points to keep</string>
+      <string>Maximum number of points to keep</string>
      </property>
      <layout class="QGridLayout" name="gridLayout_3">
       <item row="0" column="0">