Update Spanish translation and cleanup (#268)

* Fix TextTool warning

It throws the following warning:

src/tools/text/texttool.cpp:50: Class TextTool lacks Q_OBJECT macro

* Add missing translations

* Remove obsolete translations

lupdate -no-obsolete flameshot.pro

src/tools/text/texttool.h

@@ -24,6 +24,7 @@ class TextWidget;
 class TextConfig;
 
 class TextTool : public CaptureTool {
+    Q_OBJECT
 public:
     explicit TextTool(QObject *parent = nullptr);