re-work the whole install-process, now templates- and class-based; set Sparkle as default theme; set version to 0.9.29.1-dev4

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>

install/templates/lngform.tpl

@@ -0,0 +1,16 @@
+		<form action="{$formaction}" method="get">
+			<fieldset>
+				<legend>{$this->_lng['install']['lngtitle']}</legend>
+				<p>
+					<label for="language">{$this->_lng['install']['language']}:</label>&nbsp;
+					<select name="language" id="language">
+						{$language_options}
+					</select>
+				</p>
+				<p class="submit">
+					<input type="hidden" name="check" value="1" />
+					<input type="submit" name="chooselang" value="{$this->_lng['install']['lngbtn_go']}" />
+				</p>
+			</fieldset>
+		</form>
+		<aside>&nbsp;</aside>