init: Remove translation for -blockmaxsize option help

Move `-blockmaxsize`, a deprecated option which is replaced by
`-blockmaxweight`, to debug options and remove the translation.

This message is absolutely terrible for translators (esp the `* 4`
part).

Author: laanwj

src/init.cpp

@@ -490,7 +490,8 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-whitelistrelay", strprintf(_("Accept relayed transactions received from whitelisted peers even when not relaying transactions (default: %d)"), DEFAULT_WHITELISTRELAY));
 
     strUsage += HelpMessageGroup(_("Block creation options:"));
-    strUsage += HelpMessageOpt("-blockmaxsize=<n>", _("Set maximum BIP141 block weight to this * 4. Deprecated, use blockmaxweight"));
+    if (showDebug)
+        strUsage += HelpMessageOpt("-blockmaxsize=<n>", "Set maximum BIP141 block weight to this * 4. Deprecated, use blockmaxweight");
     strUsage += HelpMessageOpt("-blockmaxweight=<n>", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT));
     strUsage += HelpMessageOpt("-blockmintxfee=<amt>", strprintf(_("Set lowest fee rate (in %s/kB) for transactions to be included in block creation. (default: %s)"), CURRENCY_UNIT, FormatMoney(DEFAULT_BLOCK_MIN_TX_FEE)));
     if (showDebug)