[skip CI] Translate deepin-calculator.ts in sr

96% of minimum 50% translated source file: 'deepin-calculator.ts'
on 'sr'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/deepin-calculator_sr.ts

@@ -27,6 +27,14 @@
         <source>Select All</source>
         <translation>Изабери све</translation>
     </message>
+    <message>
+        <source>Use thousands separator</source>
+        <translation type="unfinished"/>
+    </message>
+    <message>
+        <source>Use ten-thousands separator</source>
+        <translation type="unfinished"/>
+    </message>
     <message>
         <source>Undo</source>
         <translation>Опозови</translation>
@@ -126,7 +134,7 @@
     </message>
     <message>
         <source>Add to memory item</source>
-        <translation>Додај у ставку меморије</translation>
+        <translation>Сабери са ставком меморије</translation>
     </message>
     <message>
         <source>Subtract from memory item</source>