i18n, add more translation notes

js/basicblocks.js

@@ -2675,13 +2675,15 @@ function initBasicProtoBlocks(palettes, blocks) {
     var defaultBlock = new ProtoBlock('defaultcase');
     defaultBlock.palette = palettes.dict['flow'];
     blocks.protoBlockDict['defaultcase'] = defaultBlock;
+    //.TRANS: the default case used in a switch statement in programming
     defaultBlock.staticLabels.push(_('default'));
     defaultBlock.adjustWidthToLabel();
     defaultBlock.flowClampBlock();
 
     var caseBlock = new ProtoBlock('case');
     caseBlock.palette = palettes.dict['flow'];
     blocks.protoBlockDict['case'] = caseBlock;
+    //.TRANS: the case statement used in a switch statement in programming
     caseBlock.staticLabels.push(_('case'));
     caseBlock.adjustWidthToLabel();
     caseBlock.flowClampOneArgBlock();
@@ -2690,6 +2692,7 @@ function initBasicProtoBlocks(palettes, blocks) {
     var switchBlock = new ProtoBlock('switch');
     switchBlock.palette = palettes.dict['flow'];
     blocks.protoBlockDict['switch'] = switchBlock;
+    //.TRANS: the switch statement used in programming
     switchBlock.staticLabels.push(_('switch'));
     switchBlock.adjustWidthToLabel();
     switchBlock.flowClampOneArgBlock();

po/es.po

@@ -562,7 +562,7 @@ msgstr "impar"
 
 #: js/logo.js:3254
 msgid "The Case Block must be used inside of a Switch Block."
-msgstr "El bloque de Case debe utilizarse dentro de un bloque de Switch."
+msgstr "El bloque de Caso debe utilizarse dentro de un bloque de Switch."
 
 #: js/logo.js:3327
 msgid "The Step Pitch Block must be used inside of a Note Block."
@@ -2516,11 +2516,11 @@ msgstr "objeto"
 
 #: js/basicblocks.js:2678
 msgid "default"
-msgstr ""
+msgstr "el caso por defecto"
 
 #: js/basicblocks.js:2685
 msgid "case"
-msgstr ""
+msgstr "caso"
 
 #: js/basicblocks.js:2693
 msgid "switch"