[Translations] Give translators context for separator-bearing tr() strings (#6487)

Build the card menu's related card actions from complete strings with %1
placeholders instead of appending translated fragments. This also fixes
tr(cond ? "Transform into " : "Attach to "), which lupdate cannot extract:
neither string appears in cockatrice_en@source.ts, so neither was ever
translated.

Give the EDHRec tab title a %1 placeholder so French can render
"EDHRec : %1" instead of concatenating into "EDHRec :CardName".

Keep the colon in tr("Token:") and the leading space in tr(" seconds"),
since that separator is language-specific, and attach //: translator
comments so they are no longer shown out of context on Transifex.

cockatrice/src/interface/widgets/tabs/api/edhrec/tab_edhrec_main.h

@@ -38,7 +38,8 @@ public:
     [[nodiscard]] QString getTabText() const override
     {
         auto cardName = cardToQuery.isNull() ? QString() : cardToQuery->getName();
-        return tr("EDHRec: ") + cardName;
+        //: EDHRec is a website name, keep it as written. %1 is the card being looked up.
+        return tr("EDHRec: %1").arg(cardName);
     }
 
     CardSizeWidget *getCardSizeSlider() const